diff --git a/tools_webrtc/ios/build_ios_libs.py b/tools_webrtc/ios/build_ios_libs.py
index 19ba499594..f0b28262c4 100755
--- a/tools_webrtc/ios/build_ios_libs.py
+++ b/tools_webrtc/ios/build_ios_libs.py
@@ -309,7 +309,7 @@ def main():
                 'PlistBuddy', '-c', 'Print :CFBundleShortVersionString',
                 infoplist_path
             ]
-            major_minor = subprocess.check_output(cmd).strip()
+            major_minor = subprocess.check_output(cmd).decode('utf-8').strip()
             version_number = '%s.%s' % (major_minor, args.revision)
             logging.info('Substituting revision number: %s', version_number)
             cmd = [