diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index fbc74014e9e..9e7b97c6a21 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -132,8 +132,10 @@ class CLanguage(object):
       if config.build_config in target['exclude_configs']:
         continue
       if self.platform == 'windows':
-        binary = 'vsprojects/%s/%s.exe' % (
-            _WINDOWS_CONFIG[config.build_config], target['name'])
+        binary = 'vsprojects/%s%s/%s.exe' % (
+            'x64/' if args.arch == 'x64' else '',
+            _WINDOWS_CONFIG[config.build_config],
+            target['name'])
       else:
         binary = 'bins/%s/%s' % (config.build_config, target['name'])
       if os.path.isfile(binary):