diff --git a/library/pkcs11.c b/library/pkcs11.c
index 9ef5353..ecdfde9 100644
--- a/library/pkcs11.c
+++ b/library/pkcs11.c
@@ -43,7 +43,7 @@
 
 void mbedtls_pkcs11_init( mbedtls_pkcs11_context *ctx )
 {
-    memset( ctx, 0, sizeof( mbedtls_pkcs11_context ) );
+    mbedtls_platform_memset( ctx, 0, sizeof( mbedtls_pkcs11_context ) );
 }
 
 int mbedtls_pkcs11_x509_cert_bind( mbedtls_x509_crt *cert, pkcs11h_certificate_t pkcs11_cert )