diff --git a/tools_webrtc/ensure_webcam_is_running.py b/tools_webrtc/ensure_webcam_is_running.py
index 952ebd6..10153a1 100755
--- a/tools_webrtc/ensure_webcam_is_running.py
+++ b/tools_webrtc/ensure_webcam_is_running.py
@@ -110,13 +110,14 @@
 
 
 def Main(argv):
-  if IsWebCamRunning():
-    return 0
-  if not StartWebCam():
-    return 1
+  if not IsWebCamRunning():
+    if not StartWebCam():
+      return 1
 
   if argv:
     return subprocess.call(_ForcePythonInterpreter(argv))
+  else:
+    return 0
 
 
 if __name__ == '__main__':