diff --git a/vlib/strings/builder.c.v b/vlib/strings/builder.v
similarity index 100%
rename from vlib/strings/builder.c.v
rename to vlib/strings/builder.v
diff --git a/vlib/vweb/vweb.v b/vlib/vweb/vweb.v
index a42ab85cac..b984f78657 100644
--- a/vlib/vweb/vweb.v
+++ b/vlib/vweb/vweb.v
@@ -65,8 +65,11 @@ fn (mut ctx Context) send_response_to_client(mimetype string, res string) bool {
 	sb.write('\r\n')
 	sb.write(headers_close)
 	sb.write(res)
-	ctx.conn.send_string(sb.str()) or { return false }
-	//sb.free()
+	s := sb.str()
+	defer {
+		s.free()
+	}
+	ctx.conn.send_string(s) or { return false }
 	return true
 }