diff --git a/include/kunit/test.h b/include/kunit/test.h
index fcb4a4940ace..61637ef32302 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -579,12 +579,12 @@ void __printf(2, 3) kunit_log_append(struct string_stream *log, const char *fmt,
 
 void __noreturn __kunit_abort(struct kunit *test);
 
-void __kunit_do_failed_assertion(struct kunit *test,
-			       const struct kunit_loc *loc,
-			       enum kunit_assert_type type,
-			       const struct kunit_assert *assert,
-			       assert_format_t assert_format,
-			       const char *fmt, ...);
+void __printf(6, 7) __kunit_do_failed_assertion(struct kunit *test,
+						const struct kunit_loc *loc,
+						enum kunit_assert_type type,
+						const struct kunit_assert *assert,
+						assert_format_t assert_format,
+						const char *fmt, ...);
 
 #define _KUNIT_FAILED(test, assert_type, assert_class, assert_format, INITIALIZER, fmt, ...) do { \
 	static const struct kunit_loc __loc = KUNIT_CURRENT_LOC;	       \