diff --git a/include/crypto/internal/aead.h b/include/crypto/internal/aead.h
index ba52c37b8c40e4d6c3261d2f733fc9e4b79f4979..4b2547186519f80e00729144dd8edafab238b5ef 100644
--- a/include/crypto/internal/aead.h
+++ b/include/crypto/internal/aead.h
@@ -15,12 +15,19 @@
 
 #include <crypto/aead.h>
 #include <crypto/algapi.h>
+#include <linux/stddef.h>
 #include <linux/types.h>
 
 struct rtattr;
 
 struct aead_instance {
-	struct aead_alg alg;
+	union {
+		struct {
+			char head[offsetof(struct aead_alg, base)];
+			struct crypto_instance base;
+		} s;
+		struct aead_alg alg;
+	};
 };
 
 struct crypto_aead_spawn {