--- a/third_party/dawn/tools/generate-sources-gn.py
+++ b/third_party/dawn/tools/generate-sources-gn.py
@@ -29,6 +29,7 @@
 import os
 import subprocess
 import sys
+import shutil
 
 SCRIPT_DIR = os.path.dirname(__file__)
 CMD_DIR = os.path.join(SCRIPT_DIR, 'src', 'cmd')
@@ -45,6 +46,8 @@ def main() -> int:
                              cipd_deps.get_cipd_platform(), 'bin', 'go')
     if sys.platform == 'win32':
         go_binary += '.exe'
+    if not os.path.exists(go_binary):
+        go_binary = shutil.which('go') or 'go'
 
     tool_dir = os.path.relpath(os.path.join(CMD_DIR, 'gen', 'sources'),
                                DAWN_ROOT)