diff --git a/tools/mac-universal.py b/tools/mac-universal.py
index d22f52b3..c526f21c 100755
--- a/tools/mac-universal.py
+++ b/tools/mac-universal.py
@@ -8,6 +8,7 @@ import glob
 import os
 import shutil
 import sys
+import subprocess
 
 
 def lipo(path0, path1, dst):