diff --git a/configure.ac b/configure.ac
index c65c12d54..58004262b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -177,8 +177,8 @@ CSFLAGS="$DEBUG_FLAGS $WIN64DEFINES"
 PKG_CHECK_MODULES(GLIB_2_31,
 	glib-2.0 >= 2.31,
 	HAVE_GLIB_2_31_OR_HIGHER=yes, HAVE_GLIB_2_31_OR_HIGHER=no)
-if test "x$HAVE_GLIB_2_31_OR_HIGHER" = "xyes" ; then
-	CSFLAGS="$CSFLAGS -define:DISABLE_GTHREAD_CHECK"
+if test "x$HAVE_GLIB_2_31_OR_HIGHER" = "xno" ; then
+	CSFLAGS="$CSFLAGS -define:ENABLE_GTHREAD_INIT"
 fi
 AC_SUBST(CSFLAGS)
 
diff --git a/glib/Thread.cs b/glib/Thread.cs
index 249dd048e..703256219 100644
--- a/glib/Thread.cs
+++ b/glib/Thread.cs
@@ -28,18 +28,7 @@ namespace GLib
 	{
 		private Thread () {}
 		
-#if DISABLE_GTHREAD_CHECK
-		public static void Init ()
-		{
-			// GLib automatically inits threads in 2.31 and above
-			// http://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init
-		}
-
-		public static bool Supported
-		{
-			get { return true; }
-		}
-#else
+#if ENABLE_GTHREAD_INIT
 		[DllImport ("libgthread-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
 		static extern void g_thread_init (IntPtr i);
 
@@ -57,6 +46,17 @@ namespace GLib
 				return g_thread_get_initialized ();
 			}
 		}
+#else
+		public static void Init ()
+		{
+			// GLib automatically inits threads in 2.31 and above
+			// http://developer.gnome.org/glib/unstable/glib-Deprecated-Thread-APIs.html#g-thread-init
+		}
+
+		public static bool Supported
+		{
+			get { return true; }
+		}
 #endif
 
 	}