diff --git a/test/litest.c b/test/litest.c
index 4c4a9f5c..1b7054ae 100644
--- a/test/litest.c
+++ b/test/litest.c
@@ -141,6 +141,7 @@ static void litest_setup_quirks(struct list *created_files_list,
 #define litest_vlog(...) { /* __VA_ARGS__ */ }
 #endif
 
+LIBINPUT_ATTRIBUTE_PRINTF(4, 5)
 void
 _litest_checkpoint(const char *func,
 		   int line,