diff --git a/GCryptLib/include/GCrypt/Block.h b/GCryptLib/include/GCrypt/Block.h
index 2ebbb39..db9552f 100644
--- a/GCryptLib/include/GCrypt/Block.h
+++ b/GCryptLib/include/GCrypt/Block.h
@@ -1,5 +1,5 @@
-#ifndef GCRYPT_CONFIG_H
-#define GCRYPT_CONFIG_H
+#ifndef GCRYPT_BLOCK_H
+#define GCRYPT_BLOCK_H
 
 #include "GCrypt/SecureBitset.h"
 #include "GCrypt/Config.h"