diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index d53ea3c047bcde816c4837616ff410b8217d8e05..9f5faefd1744f9951880b62edd4ce59c2df051fb 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -30,7 +30,8 @@ struct kunit_kasan_expectation {
 /* Software KASAN implementations use shadow memory. */
 
 #ifdef CONFIG_KASAN_SW_TAGS
-#define KASAN_SHADOW_INIT 0xFF
+/* This matches KASAN_TAG_INVALID. */
+#define KASAN_SHADOW_INIT 0xFE
 #else
 #define KASAN_SHADOW_INIT 0
 #endif