diff --git a/src/test/test-sizeof.c b/src/test/test-sizeof.c
index f472edcfa17..cc07dc3634e 100644
--- a/src/test/test-sizeof.c
+++ b/src/test/test-sizeof.c
@@ -62,6 +62,7 @@ int main(void) {
         info(usec_t);
         info(__time_t);
         info(pid_t);
+        info(uid_t);
         info(gid_t);
 
         info(enum Enum);