diff --git a/lib/dns/sec/openssl/include/openssl/evp.h b/lib/dns/sec/openssl/include/openssl/evp.h
index 54215b0905..f6d96f23c9 100644
--- a/lib/dns/sec/openssl/include/openssl/evp.h
+++ b/lib/dns/sec/openssl/include/openssl/evp.h
@@ -382,6 +382,7 @@ typedef struct evp_cipher_ctx_st
 #ifndef NO_CAST
 		CAST_KEY cast_ks;/* key schedule */
 #endif
+		int dummy;
 		} c;
 	} EVP_CIPHER_CTX;