diff --git a/module/zstd/zfs_zstd.c b/module/zstd/zfs_zstd.c
index fc1b0359aa..a91ed1be9e 100644
--- a/module/zstd/zfs_zstd.c
+++ b/module/zstd/zfs_zstd.c
@@ -202,6 +202,25 @@ static struct zstd_fallback_mem zstd_dctx_fallback;
 static struct zstd_pool *zstd_mempool_cctx;
 static struct zstd_pool *zstd_mempool_dctx;
 
+/*
+ * The library zstd code expects these if ADDRESS_SANITIZER gets defined,
+ * and while ASAN does this, KASAN defines that and does not. So to avoid
+ * changing the external code, we do this.
+ */
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+#define	ADDRESS_SANITIZER 1
+#endif
+#elif defined(__SANITIZE_ADDRESS__)
+#define	ADDRESS_SANITIZER 1
+#endif
+#if defined(_KERNEL) && defined(ADDRESS_SANITIZER)
+void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
+void __asan_poison_memory_region(void const volatile *addr, size_t size);
+void __asan_unpoison_memory_region(void const volatile *addr, size_t size) {};
+void __asan_poison_memory_region(void const volatile *addr, size_t size) {};
+#endif
+
 
 static void
 zstd_mempool_reap(struct zstd_pool *zstd_mempool)