diff --git a/gn b/gn
index df56bd0e54..9abc58ac4a 100755
--- a/gn
+++ b/gn
@@ -11,4 +11,4 @@ if [ "$(expr "$(uname -s)" : "^MINGW64_NT")" == "10" ]; then
     exit
 fi
 
-PYTHONDONTWRITEBYTECODE=1 exec python3 "$base_dir/gn.py" "$@"
+PYTHONDONTWRITEBYTECODE=1 "$base_dir/python-bin/python3" "$base_dir/gn.py" "$@"
diff --git a/gn.bat b/gn.bat
index 7403bfb57e..5a7c19ab99 100644
--- a/gn.bat
+++ b/gn.bat
@@ -8,5 +8,7 @@ setlocal
 :: standalone, but allow other PATH manipulations to take priority.
 set PATH=%PATH%;%~dp0
 
+set scriptdir=%~dp0
+
 :: Defer control.
-python3 "%~dp0\gn.py" %*
+@call %scriptdir%python-bin\python3 "%~dp0\gn.py" %*
diff --git a/presubmit_canned_checks.py b/presubmit_canned_checks.py
index 66971c1815..af3548faab 100644
--- a/presubmit_canned_checks.py
+++ b/presubmit_canned_checks.py
@@ -1876,7 +1876,11 @@ def CheckGNFormatted(input_api, output_api):
         ).endswith('.gni') or x.LocalPath().endswith('.typemap'))
     warnings = []
     for f in affected_files:
-        cmd = ['gn', 'format', '--dry-run', f.AbsoluteLocalPath()]
+        cmd = [
+            input_api.python3_executable,
+            input_api.os_path.join(_HERE, 'gn.py'), 'format', '--dry-run',
+            f.AbsoluteLocalPath()
+        ]
         rc = gn.main(cmd)
         if rc == 2:
             warnings.append(