diff --git a/plugins/python-build/bin/python-build b/plugins/python-build/bin/python-build
index 76c626e6..f2d485f9 100755
--- a/plugins/python-build/bin/python-build
+++ b/plugins/python-build/bin/python-build
@@ -1330,7 +1330,7 @@ cleanup_builtin_patches() {
 
 fix_directory_permissions() {
   # Ensure installed directories are not world-writable
-  find "$PREFIX_PATH" -type d \( -perm -020 -o -perm -002 \) -exec chmod go-w {} \;
+  find "$PREFIX_PATH" -type d \( -perm -020 -o -perm -002 \) -exec chmod go-w {} \+
 }
 
 require_java7() {