diff --git a/src/gsc_init.cpp b/src/gsc_init.cpp
index 3192353..6611771 100644
--- a/src/gsc_init.cpp
+++ b/src/gsc_init.cpp
@@ -342,8 +342,11 @@ bool app_init_and_loop(int& argc, char**& argv)
 // 	Glib::thread_init();
 
 #ifdef _WIN32
-	// Disable client-side decorations (enable native windows decorations) under Windows.
-	hz::env_set_value("GTK_CSD", "0");
+	std::string csd_value;
+	if (!hz::env_get_value("GTK_CSD", csd_value)) {  // if not set
+		// Disable client-side decorations (enable native windows decorations) under Windows.
+		hz::env_set_value("GTK_CSD", "0");
+	}
 #endif
 
 	// Glib needs the C locale set to system locale for command line args.