diff --git a/schemas/windows/application.gschema.xml.in b/schemas/windows/application.gschema.xml.in
index 8a3b5b6..2ce6e25 100644
--- a/schemas/windows/application.gschema.xml.in
+++ b/schemas/windows/application.gschema.xml.in
@@ -39,7 +39,7 @@
     </key>
 
     <key name="gtk-csd" type="i">
-      <default>-1</default>
+      <default>0</default>
       <summary>GTK CSD</summary>
       <description>Gtk Client side decorations</description>
     </key>
diff --git a/src/objects/application/application.c b/src/objects/application/application.c
index 01bb3d8..cd9b105 100644
--- a/src/objects/application/application.c
+++ b/src/objects/application/application.c
@@ -35,6 +35,7 @@
  #include <pw3270.h>
  #include <pw3270/application.h>
  #include <pw3270/actions.h>
+ #include <stdlib.h>
 
  enum {
 	PROP_ZERO,
@@ -207,19 +208,23 @@
 
 		g_settings_schema_source_unref(source);
 
-		// https://stackoverflow.com/questions/37035936/how-to-get-native-windows-decorations-on-gtk3-on-windows-7-and-msys2
-		int gtk_csd = g_settings_get_int(app->settings,"gtk-csd");
-		if(gtk_csd != -1) {
-			g_autofree gchar * env = g_strdup_printf("GTK_CSD=%d",gtk_csd);
-			putenv(env);
-		}
-
 #else
 
 		app->settings = g_settings_new_with_path("br.com.bb." PACKAGE_NAME, path);
 
 #endif // DEBUG
 
+#ifdef _WIN32
+		{
+			// https://stackoverflow.com/questions/37035936/how-to-get-native-windows-decorations-on-gtk3-on-windows-7-and-msys2
+			int gtk_csd = g_settings_get_int(app->settings,"gtk-csd");
+			if(gtk_csd != -1) {
+				g_autofree gchar * env = g_strdup_printf("GTK_CSD=%d",gtk_csd);
+				putenv(env);
+			}
+		}
+#endif // _WIN32
+
 		debug("app->settings=%p",app->settings);
 
 	}
--
libgit2 0.21.2