diff --git a/recipes/recipe_modules/gclient/config.py b/recipes/recipe_modules/gclient/config.py
index 77b412dd2..f9a9fe538 100644
--- a/recipes/recipe_modules/gclient/config.py
+++ b/recipes/recipe_modules/gclient/config.py
@@ -23,7 +23,7 @@ def BaseConfig(USE_MIRROR=True, CACHE_DIR=None,
                            hidden=False),
         managed = Single(bool, empty_val=True, required=False, hidden=False),
         custom_deps = Dict(value_type=(basestring, types.NoneType)),
-        custom_vars = Dict(value_type=basestring),
+        custom_vars = Dict(value_type=(basestring, types.BooleanType)),
         safesync_url = Single(basestring, required=False),
 
         revision = Single(
diff --git a/recipes/recipe_modules/gclient/examples/full.expected/basic.json b/recipes/recipe_modules/gclient/examples/full.expected/basic.json
index 17843b505..8df05f441 100644
--- a/recipes/recipe_modules/gclient/examples/full.expected/basic.json
+++ b/recipes/recipe_modules/gclient/examples/full.expected/basic.json
@@ -6,7 +6,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
+      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'custom_vars': {'string_var': 'string_val', 'true_var': True}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
diff --git a/recipes/recipe_modules/gclient/examples/full.expected/buildbot.json b/recipes/recipe_modules/gclient/examples/full.expected/buildbot.json
index 359d7cef4..52cdcba2c 100644
--- a/recipes/recipe_modules/gclient/examples/full.expected/buildbot.json
+++ b/recipes/recipe_modules/gclient/examples/full.expected/buildbot.json
@@ -6,7 +6,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
+      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'custom_vars': {'string_var': 'string_val', 'true_var': True}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
diff --git a/recipes/recipe_modules/gclient/examples/full.expected/revision.json b/recipes/recipe_modules/gclient/examples/full.expected/revision.json
index 6bc53d903..9af753b90 100644
--- a/recipes/recipe_modules/gclient/examples/full.expected/revision.json
+++ b/recipes/recipe_modules/gclient/examples/full.expected/revision.json
@@ -6,7 +6,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
+      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'custom_vars': {'string_var': 'string_val', 'true_var': True}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
diff --git a/recipes/recipe_modules/gclient/examples/full.expected/tryserver.json b/recipes/recipe_modules/gclient/examples/full.expected/tryserver.json
index 17843b505..8df05f441 100644
--- a/recipes/recipe_modules/gclient/examples/full.expected/tryserver.json
+++ b/recipes/recipe_modules/gclient/examples/full.expected/tryserver.json
@@ -6,7 +6,7 @@
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
-      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
+      "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'custom_vars': {'string_var': 'string_val', 'true_var': True}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
     "env": {
       "PATH": "<PATH>:RECIPE_PACKAGE_REPO[depot_tools]"
diff --git a/recipes/recipe_modules/gclient/examples/full.py b/recipes/recipe_modules/gclient/examples/full.py
index 6d5e9b890..80c877ec0 100644
--- a/recipes/recipe_modules/gclient/examples/full.py
+++ b/recipes/recipe_modules/gclient/examples/full.py
@@ -51,6 +51,7 @@ def RunSteps(api):
   soln.name = 'src'
   soln.url = 'https://chromium.googlesource.com/chromium/src.git'
   soln.revision = api.properties.get('revision')
+  soln.custom_vars = {'string_var': 'string_val', 'true_var': True}
   src_cfg.parent_got_revision_mapping['parent_got_revision'] = 'got_revision'
   api.gclient.c = src_cfg
   api.gclient.checkout()