diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index edcc1c8..3f3bf11 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4161,7 +4161,8 @@
 #endif
 
 #if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
-    polarssl_free( handshake->curves );
+	/* explicit void pointer cast for buggy MS compiler */
+	polarssl_free( (void *) handshake->curves );
 #endif
 
 #if defined(POLARSSL_X509_CRT_PARSE_C) && \