diff --git a/tools_webrtc/ensure_webcam_is_running.py b/tools_webrtc/ensure_webcam_is_running.py
index b68a484ea0..0856938549 100755
--- a/tools_webrtc/ensure_webcam_is_running.py
+++ b/tools_webrtc/ensure_webcam_is_running.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython3
 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
@@ -36,68 +36,68 @@ WEBCAM_MAC = ('open', '/Applications/ManyCam/ManyCam.app')
 
 
 def IsWebCamRunning():
-    if sys.platform == 'win32':
-        process_name = 'ManyCam.exe'
-    elif sys.platform.startswith('darwin'):
-        process_name = 'ManyCam'
-    elif sys.platform.startswith('linux'):
-        # TODO(bugs.webrtc.org/9636): Currently a no-op on Linux: sw webcams no
-        # longer in use.
-        print 'Virtual webcam: no-op on Linux'
+  if sys.platform == 'win32':
+    process_name = 'ManyCam.exe'
+  elif sys.platform.startswith('darwin'):
+    process_name = 'ManyCam'
+  elif sys.platform.startswith('linux'):
+    # TODO(bugs.webrtc.org/9636): Currently a no-op on Linux: sw webcams no
+    # longer in use.
+    print('Virtual webcam: no-op on Linux')
+    return True
+  else:
+    raise Exception('Unsupported platform: %s' % sys.platform)
+  for p in psutil.process_iter():
+    try:
+      if process_name == p.name:
+        print('Found a running virtual webcam (%s with PID %s)' %
+              (p.name, p.pid))
         return True
-    else:
-        raise Exception('Unsupported platform: %s' % sys.platform)
-    for p in psutil.process_iter():
-        try:
-            if process_name == p.name:
-                print 'Found a running virtual webcam (%s with PID %s)' % (
-                    p.name, p.pid)
-                return True
-        except psutil.AccessDenied:
-            pass  # This is normal if we query sys processes, etc.
-    return False
+    except psutil.AccessDenied:
+      pass  # This is normal if we query sys processes, etc.
+  return False
 
 
 def StartWebCam():
-    try:
-        if sys.platform == 'win32':
-            subprocess.check_call(WEBCAM_WIN)
-            print 'Successfully launched virtual webcam.'
-        elif sys.platform.startswith('darwin'):
-            subprocess.check_call(WEBCAM_MAC)
-            print 'Successfully launched virtual webcam.'
-        elif sys.platform.startswith('linux'):
-            # TODO(bugs.webrtc.org/9636): Currently a no-op on Linux: sw webcams no
-            # longer in use.
-            print 'Not implemented on Linux'
+  try:
+    if sys.platform == 'win32':
+      subprocess.check_call(WEBCAM_WIN)
+      print('Successfully launched virtual webcam.')
+    elif sys.platform.startswith('darwin'):
+      subprocess.check_call(WEBCAM_MAC)
+      print('Successfully launched virtual webcam.')
+    elif sys.platform.startswith('linux'):
+      # TODO(bugs.webrtc.org/9636): Currently a no-op on Linux: sw webcams no
+      # longer in use.
+      print('Not implemented on Linux')
 
-    except Exception as e:
-        print 'Failed to launch virtual webcam: %s' % e
-        return False
+  except Exception as e:
+    print('Failed to launch virtual webcam: %s' % e)
+    return False
 
-    return True
+  return True
 
 
 def _ForcePythonInterpreter(cmd):
-    """Returns the fixed command line to call the right python executable."""
-    out = cmd[:]
-    if out[0] == 'python':
-        out[0] = sys.executable
-    elif out[0].endswith('.py'):
-        out.insert(0, sys.executable)
-    return out
+  """Returns the fixed command line to call the right python executable."""
+  out = cmd[:]
+  if out[0] == 'python':
+    out[0] = sys.executable
+  elif out[0].endswith('.py'):
+    out.insert(0, sys.executable)
+  return out
 
 
 def Main(argv):
-    if not IsWebCamRunning():
-        if not StartWebCam():
-            return 1
+  if not IsWebCamRunning():
+    if not StartWebCam():
+      return 1
 
-    if argv:
-        return subprocess.call(_ForcePythonInterpreter(argv))
-    else:
-        return 0
+  if argv:
+    return subprocess.call(_ForcePythonInterpreter(argv))
+  else:
+    return 0
 
 
 if __name__ == '__main__':
-    sys.exit(Main(sys.argv[1:]))
+  sys.exit(Main(sys.argv[1:]))