diff --git a/mongoose.c b/mongoose.c
index c27f6a2d..0700bd51 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -2694,7 +2694,7 @@ static void connect_conn(struct mg_connection *c) {
   if (rc == EAGAIN || rc == EWOULDBLOCK) rc = 0;
   c->is_connecting = 0;
   if (rc) {
-    mg_call(c, MG_EV_ERROR, "connect error");
+    mg_call(c, MG_EV_ERROR, (void *) "connect error");
     c->is_closing = 1;
   } else {
     if (c->is_tls_hs && mg_tls_handshake(c)) {