diff --git a/src/or/routerparse.c b/src/or/routerparse.c
index 7d58aad684..fa69c7408f 100644
--- a/src/or/routerparse.c
+++ b/src/or/routerparse.c
@@ -330,6 +330,7 @@ check_software_version_against_directory(const char *directory)
      "Please use %s%s.",
       VERSION, strchr(v,',') ? "one of " : "", v);
   tor_free(v);
+  return 0;
 }
 
 /** Parse a directory from <b>str</b> and, when done, store the