diff --git a/UI/obs-app.cpp b/UI/obs-app.cpp
index 02cf48d6c..0ea5b0aba 100644
--- a/UI/obs-app.cpp
+++ b/UI/obs-app.cpp
@@ -2302,6 +2302,15 @@ static int run_program(fstream &logFile, int argc, char *argv[])
 
 	setenv("QT_STYLE_OVERRIDE", "Fusion", false);
 
+#if OBS_QT_VERSION == 6
+	/* NOTE: Users blindly set this, but this theme is incompatble with Qt6 and
+	 * crashes loading saved geometry. Just turn off this theme and let users complain OBS
+	 * looks ugly instead of crashing. */
+	const char *platform_theme = getenv("QT_QPA_PLATFORMTHEME");
+	if (platform_theme && strcmp(platform_theme, "qt5ct") == 0)
+		unsetenv("QT_QPA_PLATFORMTHEME");
+#endif
+
 #if defined(ENABLE_WAYLAND) && defined(USE_XDG)
 	/* NOTE: Qt doesn't use the Wayland platform on GNOME, so we have to
 	 * force it using the QT_QPA_PLATFORM env var. It's still possible to