diff --git a/src/netif/ppp/polarssl/md4.h b/src/netif/ppp/polarssl/md4.h
index 86493dea..7fe5985f 100644
--- a/src/netif/ppp/polarssl/md4.h
+++ b/src/netif/ppp/polarssl/md4.h
@@ -43,9 +43,6 @@ typedef struct
     unsigned long total[2];     /*!< number of bytes processed  */
     unsigned long state[4];     /*!< intermediate digest state  */
     unsigned char buffer[64];   /*!< data block being processed */
-
-    unsigned char ipad[64];     /*!< HMAC: inner padding        */
-    unsigned char opad[64];     /*!< HMAC: outer padding        */
 }
 md4_context;
 
diff --git a/src/netif/ppp/polarssl/md5.h b/src/netif/ppp/polarssl/md5.h
index 95e115f1..2103f00e 100644
--- a/src/netif/ppp/polarssl/md5.h
+++ b/src/netif/ppp/polarssl/md5.h
@@ -43,9 +43,6 @@ typedef struct
     unsigned long total[2];     /*!< number of bytes processed  */
     unsigned long state[4];     /*!< intermediate digest state  */
     unsigned char buffer[64];   /*!< data block being processed */
-
-    unsigned char ipad[64];     /*!< HMAC: inner padding        */
-    unsigned char opad[64];     /*!< HMAC: outer padding        */
 }
 md5_context;
 
diff --git a/src/netif/ppp/polarssl/sha1.h b/src/netif/ppp/polarssl/sha1.h
index 168b2d7c..5f69aef7 100644
--- a/src/netif/ppp/polarssl/sha1.h
+++ b/src/netif/ppp/polarssl/sha1.h
@@ -43,9 +43,6 @@ typedef struct
     unsigned long total[2];     /*!< number of bytes processed  */
     unsigned long state[5];     /*!< intermediate digest state  */
     unsigned char buffer[64];   /*!< data block being processed */
-
-    unsigned char ipad[64];     /*!< HMAC: inner padding        */
-    unsigned char opad[64];     /*!< HMAC: outer padding        */
 }
 sha1_context;