diff --git a/tests/hashtest.c b/tests/hashtest.c
index 414832eacaed0edef0ffe086bfcc2dbc2c910469..bb3a8128df227a8f1d554839828e55d3245b9e6c 100644
--- a/tests/hashtest.c
+++ b/tests/hashtest.c
@@ -360,7 +360,7 @@ testHashForEach(const void *data ATTRIBUTE_UNUSED)
     if (count != ARRAY_CARDINALITY(uuids)) {
         if (virTestGetVerbose()) {
             testError("\nvirHashForEach didn't go through all entries,"
-                      " %d != %lu\n",
+                      " %d != %zu\n",
                       count, ARRAY_CARDINALITY(uuids));
         }
         goto cleanup;