diff --git a/src/filesystem.c b/src/filesystem.c
index c88e74ae..ddd68fbe 100644
--- a/src/filesystem.c
+++ b/src/filesystem.c
@@ -480,7 +480,7 @@ rcutils_dir_iter_next(rcutils_dir_iter_t * iter)
 {
   RCUTILS_CHECK_ARGUMENT_FOR_NULL(iter, false);
   rcutils_dir_iter_state_t * state = (rcutils_dir_iter_state_t *)iter->state;
-  RCUTILS_CHECK_FOR_NULL_WITH_MSG(state, "iter is invalid", false);
+  RCUTILS_CHECK_FOR_NULL_WITH_MSG(state, "iter is invalid", return false);
 
 #ifdef _WIN32
   if (FindNextFile(state->handle, &state->data)) {