diff --git a/tests/domaincapstest.c b/tests/domaincapstest.c
index fb803eaa47..c3a9f4ef91 100644
--- a/tests/domaincapstest.c
+++ b/tests/domaincapstest.c
@@ -369,7 +369,7 @@ mymain(void)
 #endif
 
 #if WITH_QEMU
-    virQEMUDriverConfigPtr cfg = virQEMUDriverConfigNew(false, "");
+    virQEMUDriverConfigPtr cfg = virQEMUDriverConfigNew(false, NULL);
 
     if (!cfg)
         return EXIT_FAILURE;
diff --git a/tests/testutilsqemu.c b/tests/testutilsqemu.c
index f3b4e2b3b2..cb68ac0488 100644
--- a/tests/testutilsqemu.c
+++ b/tests/testutilsqemu.c
@@ -390,7 +390,7 @@ int qemuTestDriverInit(virQEMUDriver *driver)
         return -1;
 
     driver->hostarch = virArchFromHost();
-    driver->config = virQEMUDriverConfigNew(false, "");
+    driver->config = virQEMUDriverConfigNew(false, NULL);
     if (!driver->config)
         goto error;