diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 7fa0a56..fdb647a 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -4796,7 +4796,7 @@
     }
     else
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
-    mbedtls_platform_zeroize( ssl->in_ctr, MBEDTLS_SSL_SEQUENCE_NUMBER_LEN );
+    memset( ssl->in_ctr, 0, MBEDTLS_SSL_SEQUENCE_NUMBER_LEN );
 
     mbedtls_ssl_update_in_pointers( ssl );
 
@@ -5562,14 +5562,14 @@
                                         mbedtls_ssl_transform *transform )
 {
     ssl->transform_in = transform;
-    mbedtls_platform_zeroize( ssl->in_ctr, MBEDTLS_SSL_SEQUENCE_NUMBER_LEN );
+    memset( ssl->in_ctr, 0, MBEDTLS_SSL_SEQUENCE_NUMBER_LEN );
 }
 
 void mbedtls_ssl_set_outbound_transform( mbedtls_ssl_context *ssl,
                                          mbedtls_ssl_transform *transform )
 {
     ssl->transform_out = transform;
-    mbedtls_platform_zeroize( ssl->cur_out_ctr, sizeof( ssl->cur_out_ctr ) );
+    memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) );
 }
 
 #if defined(MBEDTLS_SSL_PROTO_DTLS)