diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index d2f4361..2b75267 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -593,7 +593,7 @@
 
 #define MBEDTLS_PREMASTER_SIZE     sizeof( union mbedtls_ssl_premaster_secret )
 
-/* Length of in_ctr buffer in mbedtls_ssl_session */
+/* Length in number of bytes of the TLS sequence number */
 #define MBEDTLS_SSL_COUNTER_LEN 8
 
 #ifdef __cplusplus
diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 25e3ca3..e636762 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -2101,7 +2101,7 @@
 static int ssl_swap_epochs( mbedtls_ssl_context *ssl )
 {
     mbedtls_ssl_transform *tmp_transform;
-    unsigned char tmp_out_ctr[8];
+    unsigned char tmp_out_ctr[MBEDTLS_SSL_COUNTER_LEN];
 
     if( ssl->transform_out == ssl->handshake->alt_transform_out )
     {
@@ -2117,9 +2117,11 @@
     ssl->handshake->alt_transform_out = tmp_transform;
 
     /* Swap epoch + sequence_number */
-    memcpy( tmp_out_ctr,                 ssl->cur_out_ctr,            sizeof( ssl->cur_out_ctr ) );
-    memcpy( ssl->cur_out_ctr,            ssl->handshake->alt_out_ctr, sizeof( ssl->cur_out_ctr ) );
-    memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr,                 sizeof( ssl->handshake->alt_out_ctr ) );
+    memcpy( tmp_out_ctr, ssl->cur_out_ctr, sizeof( tmp_out_ctr ) );
+    memcpy( ssl->cur_out_ctr, ssl->handshake->alt_out_ctr,
+            sizeof( ssl->cur_out_ctr ) );
+    memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr,
+            sizeof( ssl->handshake->alt_out_ctr ) );
 
     /* Adjust to the newly activated transform */
     mbedtls_ssl_update_out_pointers( ssl, ssl->transform_out );
@@ -2562,7 +2564,7 @@
         mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
                            ssl->conf->transport, ssl->out_hdr + 1 );
 
-        memcpy( ssl->out_ctr, ssl->cur_out_ctr, sizeof( ssl->cur_out_ctr ) );
+        memcpy( ssl->out_ctr, ssl->cur_out_ctr, MBEDTLS_SSL_COUNTER_LEN );
         MBEDTLS_PUT_UINT16_BE( len, ssl->out_len, 0);
 
         if( ssl->transform_out != NULL )
@@ -2574,7 +2576,7 @@
             rec.data_len    = ssl->out_msglen;
             rec.data_offset = ssl->out_msg - rec.buf;
 
-            memcpy( &rec.ctr[0], ssl->out_ctr, MBEDTLS_SSL_COUNTER_LEN );
+            memcpy( &rec.ctr[0], ssl->out_ctr, sizeof( rec.ctr ) );
             mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
                                        ssl->conf->transport, rec.ver );
             rec.type = ssl->out_msgtype;
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 79c160e..e27fdff 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -1221,7 +1221,7 @@
         }
 
         memcpy( &ssl->cur_out_ctr[2], ssl->in_ctr + 2,
-                MBEDTLS_SSL_COUNTER_LEN - 2 );
+                sizeof( ssl->cur_out_ctr ) - 2 );
 
 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
         if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index b22db47..58b81ff 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -2821,7 +2821,7 @@
         /* Remember current epoch settings for resending */
         ssl->handshake->alt_transform_out = ssl->transform_out;
         memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr,
-                sizeof( ssl->cur_out_ctr ) );
+                sizeof( ssl->handshake->alt_out_ctr ) );
 
         /* Set sequence_number to zero */
         mbedtls_platform_zeroize( &ssl->cur_out_ctr[2],
@@ -5778,11 +5778,11 @@
     }
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
 
-    used += 8;
+    used += MBEDTLS_SSL_COUNTER_LEN;
     if( used <= buf_len )
     {
-        memcpy( p, ssl->cur_out_ctr, sizeof( ssl->cur_out_ctr ) );
-        p += 8;
+        memcpy( p, ssl->cur_out_ctr, MBEDTLS_SSL_COUNTER_LEN );
+        p += MBEDTLS_SSL_COUNTER_LEN;
     }
 
 #if defined(MBEDTLS_SSL_PROTO_DTLS)
@@ -6040,7 +6040,6 @@
 
     if( (size_t)( end - p ) < sizeof( ssl->cur_out_ctr ) )
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-
     memcpy( ssl->cur_out_ctr, p, sizeof( ssl->cur_out_ctr ) );
     p += sizeof( ssl->cur_out_ctr );