diff --git a/recipe_modules/bot_update/api.py b/recipe_modules/bot_update/api.py
index f1f31bd1c..540ba8db3 100644
--- a/recipe_modules/bot_update/api.py
+++ b/recipe_modules/bot_update/api.py
@@ -34,7 +34,7 @@ class BotUpdateApi(recipe_api.RecipeApi):
     kwargs.setdefault('env', {})
     kwargs['env'].setdefault('PATH', '%(PATH)s')
     kwargs['env']['PATH'] = self.m.path.pathsep.join([
-        kwargs['env']['PATH'], str(self._module.PACKAGE_REPO_ROOT)])
+        str(self._module.PACKAGE_REPO_ROOT), kwargs['env']['PATH']])
     return self.m.python(name, bot_update_path, cmd, **kwargs)
 
   @property
diff --git a/recipe_modules/bot_update/example.expected/basic.json b/recipe_modules/bot_update/example.expected/basic.json
index 75efd0a84..820c2194e 100644
--- a/recipe_modules/bot_update/example.expected/basic.json
+++ b/recipe_modules/bot_update/example.expected/basic.json
@@ -18,7 +18,7 @@
       "src@abc"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update (without patch)",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/basic_output_manifest.json b/recipe_modules/bot_update/example.expected/basic_output_manifest.json
index f333cf606..faf07c98b 100644
--- a/recipe_modules/bot_update/example.expected/basic_output_manifest.json
+++ b/recipe_modules/bot_update/example.expected/basic_output_manifest.json
@@ -19,7 +19,7 @@
       "--output_manifest"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/basic_with_branch_heads.json b/recipe_modules/bot_update/example.expected/basic_with_branch_heads.json
index b3c34c0ab..b3384d89e 100644
--- a/recipe_modules/bot_update/example.expected/basic_with_branch_heads.json
+++ b/recipe_modules/bot_update/example.expected/basic_with_branch_heads.json
@@ -19,7 +19,7 @@
       "--with_branch_heads"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update - with branch heads",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/clobber.json b/recipe_modules/bot_update/example.expected/clobber.json
index 0f511633e..870062e23 100644
--- a/recipe_modules/bot_update/example.expected/clobber.json
+++ b/recipe_modules/bot_update/example.expected/clobber.json
@@ -19,7 +19,7 @@
       "--clobber"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/gerrit_no_rebase_patch_ref.json b/recipe_modules/bot_update/example.expected/gerrit_no_rebase_patch_ref.json
index cbaab11c6..4f27a4e40 100644
--- a/recipe_modules/bot_update/example.expected/gerrit_no_rebase_patch_ref.json
+++ b/recipe_modules/bot_update/example.expected/gerrit_no_rebase_patch_ref.json
@@ -19,7 +19,7 @@
       "--gerrit_no_rebase_patch_ref"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/gerrit_no_reset.json b/recipe_modules/bot_update/example.expected/gerrit_no_reset.json
index 118998391..820e50f37 100644
--- a/recipe_modules/bot_update/example.expected/gerrit_no_reset.json
+++ b/recipe_modules/bot_update/example.expected/gerrit_no_reset.json
@@ -19,7 +19,7 @@
       "--gerrit_no_reset"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/no_shallow.json b/recipe_modules/bot_update/example.expected/no_shallow.json
index 0c5ffe3e0..94fbe4266 100644
--- a/recipe_modules/bot_update/example.expected/no_shallow.json
+++ b/recipe_modules/bot_update/example.expected/no_shallow.json
@@ -19,7 +19,7 @@
       "--no_shallow"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/reset_root_solution_revision.json b/recipe_modules/bot_update/example.expected/reset_root_solution_revision.json
index 0d9fb489b..aa7bf1d14 100644
--- a/recipe_modules/bot_update/example.expected/reset_root_solution_revision.json
+++ b/recipe_modules/bot_update/example.expected/reset_root_solution_revision.json
@@ -18,7 +18,7 @@
       "src@revision"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/trychange.json b/recipe_modules/bot_update/example.expected/trychange.json
index 2a6e0ac39..9887237fa 100644
--- a/recipe_modules/bot_update/example.expected/trychange.json
+++ b/recipe_modules/bot_update/example.expected/trychange.json
@@ -20,7 +20,7 @@
       "+refs/change/1/2/333"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/trychange_oauth2.json b/recipe_modules/bot_update/example.expected/trychange_oauth2.json
index b0917d4bf..f24f886c0 100644
--- a/recipe_modules/bot_update/example.expected/trychange_oauth2.json
+++ b/recipe_modules/bot_update/example.expected/trychange_oauth2.json
@@ -22,7 +22,7 @@
       "src@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob.json b/recipe_modules/bot_update/example.expected/tryjob.json
index ee56bb199..da7f5c232 100644
--- a/recipe_modules/bot_update/example.expected/tryjob.json
+++ b/recipe_modules/bot_update/example.expected/tryjob.json
@@ -24,7 +24,7 @@
       "src@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_fail.json b/recipe_modules/bot_update/example.expected/tryjob_fail.json
index 7f720ab35..0fee00658 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_fail.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_fail.json
@@ -24,7 +24,7 @@
       "src@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_fail_patch.json b/recipe_modules/bot_update/example.expected/tryjob_fail_patch.json
index ed3caebc5..fab3f12b2 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_fail_patch.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_fail_patch.json
@@ -24,7 +24,7 @@
       "src@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_fail_patch_download.json b/recipe_modules/bot_update/example.expected/tryjob_fail_patch_download.json
index 4328d4b90..7558d3ddb 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_fail_patch_download.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_fail_patch_download.json
@@ -24,7 +24,7 @@
       "src@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_gerrit_angle.json b/recipe_modules/bot_update/example.expected/tryjob_gerrit_angle.json
index 4d1d7b89a..e3c452595 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_gerrit_angle.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_gerrit_angle.json
@@ -24,7 +24,7 @@
       "src/third_party/angle@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_v8.json b/recipe_modules/bot_update/example.expected/tryjob_v8.json
index 105604bc7..ed76b2ada 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_v8.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_v8.json
@@ -26,7 +26,7 @@
       "src/v8@abc"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
diff --git a/recipe_modules/bot_update/example.expected/tryjob_v8_head_by_default.json b/recipe_modules/bot_update/example.expected/tryjob_v8_head_by_default.json
index ed4352e21..47e9c9014 100644
--- a/recipe_modules/bot_update/example.expected/tryjob_v8_head_by_default.json
+++ b/recipe_modules/bot_update/example.expected/tryjob_v8_head_by_default.json
@@ -26,7 +26,7 @@
       "src/v8@HEAD"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [