diff --git a/sys/vm/redzone.c b/sys/vm/redzone.c
index affaa5008a22..88e36c41b928 100644
--- a/sys/vm/redzone.c
+++ b/sys/vm/redzone.c
@@ -37,6 +37,10 @@ __FBSDID("$FreeBSD$");
 
 #include <vm/redzone.h>
 
+#ifdef KASAN
+#error KASAN and DEBUG_REDZONE cannot be configured together
+#endif
+
 static SYSCTL_NODE(_vm, OID_AUTO, redzone, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
     "RedZone data");
 static u_long redzone_extra_mem = 0;