diff --git a/kernel/Makefile b/kernel/Makefile
index 5c714059..db4401c6 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -132,6 +132,8 @@ ifeq ($(shell grep -q "atomic_inc_not_zero" $(srctree)/kernel/cred.c; echo $$?),
 ATOMIC_INC_FUNC = atomic_inc_not_zero
 else ifeq ($(shell grep -q "atomic_long_inc_not_zero" $(srctree)/kernel/cred.c; echo $$?),0)
 ATOMIC_INC_FUNC = atomic_long_inc_not_zero
+else
+$(error -- KSU_SUSFS: Neither atomic_inc_not_zero nor atomic_long_inc_not_zero found in kernel/cred.c)
 endif
 
 ifneq ($(shell grep -Eq "^static inline const struct cred \*get_cred_rcu" $(srctree)/include/linux/cred.h; echo $$?),0)