--- upstream/proton
+++ mod/proton
@@ -1462,6 +1462,8 @@
         prepend_to_env_str(self.env, ld_path_var, g_proton.lib64_dir + ":" + g_proton.lib_dir, ":")
 
         self.env["WINEDLLPATH"] = g_proton.lib64_dir + "/wine:" + g_proton.lib_dir + "/wine"
+        if len(os.getenv("WINEDLLPATH") or ""):
+            self.env["WINEDLLPATH"] = os.getenv("WINEDLLPATH").strip(":") + ":" + self.env["WINEDLLPATH"]
 
         self.env["GST_PLUGIN_SYSTEM_PATH_1_0"] = g_proton.lib64_dir + "gstreamer-1.0" + ":" + g_proton.lib_dir + "gstreamer-1.0"
         self.env["WINE_GST_REGISTRY_DIR"] = g_compatdata.path("gstreamer-1.0/")