diff --git a/lib/kunit/hooks-impl.h b/lib/kunit/hooks-impl.h
index ec745a3..4e71b2d 100644
--- a/lib/kunit/hooks-impl.h
+++ b/lib/kunit/hooks-impl.h
@@ -15,7 +15,9 @@
 #include <kunit/test-bug.h>
 
 /* List of declarations. */
-void __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...);
+void __printf(3, 4) __kunit_fail_current_test_impl(const char *file,
+						   int line,
+						   const char *fmt, ...);
 void *__kunit_get_static_stub_address_impl(struct kunit *test, void *real_fn_addr);
 
 /* Code to set all of the function pointers. */
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 51cae59..c9e15bb 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -24,7 +24,7 @@
 /*
  * Hook to fail the current test and print an error message to the log.
  */
-void __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...)
+void __printf(3, 4) __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...)
 {
 	va_list args;
 	int len;