diff --git a/library/ecdh.c b/library/ecdh.c
index c572687..03763ff 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -179,7 +179,7 @@
     mbedtls_ecp_point_init( &ctx->Vf  );
     mbedtls_mpi_init( &ctx->_d );
 #else
-    memset( ctx, 0, sizeof( mbedtls_ecdh_context ) );
+    mbedtls_platform_memset( ctx, 0, sizeof( mbedtls_ecdh_context ) );
 
     ctx->var = MBEDTLS_ECDH_VARIANT_NONE;
 #endif