diff --git a/tools/test/ppsapi/ppsapitest.c b/tools/test/ppsapi/ppsapitest.c
index 78e73825e16c..ef655e96d6df 100644
--- a/tools/test/ppsapi/ppsapitest.c
+++ b/tools/test/ppsapi/ppsapitest.c
@@ -72,7 +72,7 @@ main(int argc, char **argv)
 	if (argc > 0) {
 		fd = open(argv[0], O_RDONLY);
 		if (fd < 0) 
-			err(1, argv[0]);
+			err(1, "%s", argv[0]);
 	} else {
 		fd = 0;
 	}