diff --git a/clang/tools/clang-format/clang-format-diff.py b/clang/tools/clang-format/clang-format-diff.py
--- a/clang/tools/clang-format/clang-format-diff.py
+++ b/clang/tools/clang-format/clang-format-diff.py
@@ -147,11 +147,11 @@
         if args.fallback_style:
           command.extend(['-fallback-style', args.fallback_style])
         try:
-          procs[i] = (subprocess.Popen(command,
-                                        stdout=subprocess.PIPE,
-                                        stderr=None,
-                                        stdin=subprocess.PIPE,
-                                        universal_newlines=True))
+          procs[i] = subprocess.Popen(command,
+                                      stdout=subprocess.PIPE,
+                                      stderr=None,
+                                      stdin=subprocess.PIPE,
+                                      universal_newlines=True)
         except OSError as e:
           # Give the user more context when clang-format isn't
           # found/isn't executable, etc.