diff --git a/src/frame-xchg.c b/src/frame-xchg.c
index ce69c454..fa4abb7c 100644
--- a/src/frame-xchg.c
+++ b/src/frame-xchg.c
@@ -522,6 +522,7 @@ static bool frame_watch_check_duplicate(void *data, void *user_data)
 	}
 
 	/* Drop the existing watch as a duplicate of the new one */
+	frame_watch_free(&watch->super);
 	return true;
 }