diff --git a/include/polarssl/md2.h b/include/polarssl/md2.h
index 9a497f1..2726ca3 100644
--- a/include/polarssl/md2.h
+++ b/include/polarssl/md2.h
@@ -38,8 +38,8 @@
     unsigned char state[48];    /*!< intermediate digest state  */
     unsigned char buffer[16];   /*!< data block being processed */
 
-    unsigned char ipad[64];     /*!< HMAC: inner padding        */
-    unsigned char opad[64];     /*!< HMAC: outer padding        */
+    unsigned char ipad[16];     /*!< HMAC: inner padding        */
+    unsigned char opad[16];     /*!< HMAC: outer padding        */
     size_t left;                /*!< amount of data in buffer   */
 }
 md2_context;