diff --git a/tests/qemuxml2argvmock.c b/tests/qemuxml2argvmock.c
index 914d2bcf9fe52d62eb8057a185009673158f8a4c..8143de16185777cd52dcb800e318394e7900053a 100644
--- a/tests/qemuxml2argvmock.c
+++ b/tests/qemuxml2argvmock.c
@@ -169,7 +169,7 @@ virNetDevSetMAC(const char *ifname G_GNUC_UNUSED,
 int
 virNetDevExists(const char *ifname)
 {
-    return STREQ_NULLABLE(ifname, "mytap0");
+    return STREQ(ifname, "mytap0");
 }