diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 36a3e20..b749d93 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -54,7 +54,7 @@
 #include "mbedtls/oid.h"
 #endif
 
-#define MBEDTLS_SSL_IN_CTR_LEN 8
+#define SSL_CONTEXT_INPUT_COUNTER_LEN 8
 
 static uint32_t ssl_get_hs_total_len( mbedtls_ssl_context const *ssl );
 
@@ -4793,7 +4793,7 @@
     }
     else
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
-    mbedtls_platform_zeroize( ssl->in_ctr, MBEDTLS_SSL_IN_CTR_LEN );
+    mbedtls_platform_zeroize( ssl->in_ctr, SSL_CONTEXT_INPUT_COUNTER_LEN );
 
     mbedtls_ssl_update_in_pointers( ssl );
 
@@ -5560,7 +5560,7 @@
         return;
 
     ssl->transform_in = transform;
-    mbedtls_platform_zeroize( ssl->in_ctr, MBEDTLS_SSL_IN_CTR_LEN );
+    mbedtls_platform_zeroize( ssl->in_ctr, SSL_CONTEXT_INPUT_COUNTER_LEN );
 }
 
 void mbedtls_ssl_set_outbound_transform( mbedtls_ssl_context *ssl,