diff --git a/native/os_x11_linux.cc b/native/os_x11_linux.cc
index 8791d71..9cefad2 100644
--- a/native/os_x11_linux.cc
+++ b/native/os_x11_linux.cc
@@ -138,12 +138,25 @@ bool IsRsWindow(const xcb_window_t window) {
 			memcpy(buffer, xcb_get_property_value(replyProp), len);
 			// first is instance name, then class name - both null terminated. we want class name.
 			const char* classname = buffer + strlen(buffer) + 1;
-			if (strcmp(classname, "RuneScape") == 0 || strcmp(classname, "steam_app_1343400") == 0 || strcmp(classname, "rs2client.exe") == 0) {
+			if (strcmp(classname, "RuneScape") == 0 || strcmp(classname, "steam_app_1343400") == 0 || strcmp(classname, "steam_proton") == 0 || strcmp(classname, "rs2client.exe") == 0) {
 				auto replyTransient = xcb_get_property_reply(connection, cookieTransient, NULL);
-				if (replyTransient && xcb_get_property_value_length(replyTransient) == 0) {
-					free(replyProp);
-					return true;
+				xcb_get_property_cookie_t cookie = xcb_get_property_unchecked(connection, 0, window, XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 0, 100);
+				std::unique_ptr<xcb_get_property_reply_t, decltype(&free)> reply { xcb_get_property_reply(connection, cookie, NULL), &free };
+				if(reply) {
+					char* title = reinterpret_cast<char*>(xcb_get_property_value(reply.get()));
+					int length = xcb_get_property_value_length(reply.get());
+					auto str_title = std::string(title, length);
+					/* Covers both normal and compatibility mode (substring of RuneScape (compatibility mode) )*/
+					if (str_title.compare(0, sizeof("RuneScape") - 1, "RuneScape") == 0) {
+						if (replyTransient && xcb_get_property_value_length(replyTransient) == 0) {
+							free(replyProp);
+							return true;
+						} else {
+							std::cout << "NonTransient window found: " << str_title << std::endl;
+						}
+					}
 				}
+
 			}
 		}
 	}