diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 041daf4..26f216d 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -308,7 +308,7 @@
       OPTIONS.search_path = a
     elif o in ("-s", "--device_specific"):
       OPTIONS.device_specific = a
-    elif o in ("-x" "--extra"):
+    elif o in ("-x", "--extra"):
       key, value = a.split("=", 1)
       OPTIONS.extras[key] = value
     else: