diff --git a/zefie_wtvp_minisrv/WTVMime.js b/zefie_wtvp_minisrv/WTVMime.js
index 386e6eee..3f596c44 100644
--- a/zefie_wtvp_minisrv/WTVMime.js
+++ b/zefie_wtvp_minisrv/WTVMime.js
@@ -40,9 +40,9 @@ class WTVMime {
                         // if gzip is enabled...
                         if (this.minisrv_config.config.enable_gzip_compression || this.minisrv_config.config.force_compression_type) {
                             var is_bf0app = ssid_session.get("wtv-client-rom-type") == "bf0app";
-                            var is_minibrowser = this.wtvshared.isMiniBrowser(ssid_session);
+                            var isOldBuild = this.wtvshared.isOldBuild(ssid_session);
                             var is_softmodem = ssid_session.get("wtv-client-rom-type").match(/softmodem/);
-                            if (!is_bf0app && ((!is_softmodem && !is_minibrowser) || (is_softmodem && !is_minibrowser))) {
+                            if (!is_bf0app && ((!is_softmodem && !isOldBuild) || (is_softmodem && !isOldBuild))) {
                                 // softmodem boxes do not appear to support gzip in the minibrowser
                                 // LC2 appears to support gzip even in the MiniBrowser
                                 // LC2 and newer approms appear to support gzip