diff --git a/aes.h b/aes.h
index 39973ea..41248d6 100644
--- a/aes.h
+++ b/aes.h
@@ -41,11 +41,12 @@
     #define AES_keyExpSize 176
 #endif
 
-struct AES_ctx {
+struct AES_ctx
+{
   uint8_t RoundKey[AES_keyExpSize];
-  #if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
+#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
   uint8_t Iv[AES_BLOCKLEN];
-  #endif
+#endif
 };
 
 void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);