--- a/sys/kern/kern_varsym.c
+++ b/sys/kern/kern_varsym.c
@@ -172,6 +172,9 @@
 	    error = varsymmake(level, name, NULL);
 	}
 	break;
+    default:
+	error = EINVAL;
+	break;
     }
 done1:
     kfree(buf, M_TEMP);