diff --git a/tests/virnetdevbandwidthtest.c b/tests/virnetdevbandwidthtest.c
index d5e4092fc3..fced657811 100644
--- a/tests/virnetdevbandwidthtest.c
+++ b/tests/virnetdevbandwidthtest.c
@@ -93,9 +93,7 @@ testVirNetDevBandwidthSet(const void *data)
     }
 
     if (STRNEQ_NULLABLE(exp_cmd, actual_cmd)) {
-        virTestDifference(stderr,
-                          NULLSTR(exp_cmd),
-                          NULLSTR(actual_cmd));
+        virTestDifference(stderr, exp_cmd, actual_cmd);
         return -1;
     }
 
diff --git a/tests/virnetdevopenvswitchtest.c b/tests/virnetdevopenvswitchtest.c
index 57860f4bc4..e5883eb076 100644
--- a/tests/virnetdevopenvswitchtest.c
+++ b/tests/virnetdevopenvswitchtest.c
@@ -176,9 +176,7 @@ testVirNetDevOpenvswitchInterfaceSetQos(const void *data)
     }
 
     if (STRNEQ_NULLABLE(info->exp_cmd, actual_cmd)) {
-        virTestDifference(stderr,
-                          NULLSTR(info->exp_cmd),
-                          NULLSTR(actual_cmd));
+        virTestDifference(stderr, info->exp_cmd, actual_cmd);
         return -1;
     }
 
@@ -207,9 +205,7 @@ testVirNetDevOpenvswitchInterfaceClearQos(const void *data)
     }
 
     if (STRNEQ_NULLABLE(info->exp_cmd, actual_cmd)) {
-        virTestDifference(stderr,
-                          NULLSTR(info->exp_cmd),
-                          NULLSTR(actual_cmd));
+        virTestDifference(stderr, info->exp_cmd, actual_cmd);
         return -1;
     }