diff --git a/gstreamer-sharp/TypeFind.custom b/gstreamer-sharp/TypeFind.custom
index 70d99fed48..3d48041365 100644
--- a/gstreamer-sharp/TypeFind.custom
+++ b/gstreamer-sharp/TypeFind.custom
@@ -1,12 +1,14 @@
 [DllImport ("gstreamer-0.10.dll") ]
-static extern bool gst_type_find_register (IntPtr plugin, IntPtr name, uint rank, GstSharp.TypeFindFunctionNative func, IntPtr extensions, IntPtr possible_caps, IntPtr data, IntPtr data_notify);
+static extern bool gst_type_find_register (IntPtr plugin, IntPtr name, uint rank, GstSharp.TypeFindFunctionNative func, IntPtr[] extensions, IntPtr possible_caps, IntPtr data, IntPtr data_notify);
 
-public static bool Register (Gst.Plugin plugin, string name, uint rank, Gst.TypeFindFunction func, string extensions, Gst.Caps possible_caps) {
+public static bool Register (Gst.Plugin plugin, string name, uint rank, Gst.TypeFindFunction func, string[] extensions, Gst.Caps possible_caps) {
   IntPtr native_name = GLib.Marshaller.StringToPtrGStrdup (name);
+  IntPtr[] native_extensions = GLib.Marshaller.StringArrayToNullTermPointer (extensions);
   GstSharp.TypeFindFunctionWrapper func_wrapper = new GstSharp.TypeFindFunctionWrapper (func);
-  bool raw_ret = gst_type_find_register (plugin == null ? IntPtr.Zero : plugin.Handle, native_name, rank, func_wrapper.NativeDelegate, GLib.Marshaller.StringToPtrGStrdup (extensions), possible_caps == null ? IntPtr.Zero : possible_caps.Handle, IntPtr.Zero, IntPtr.Zero);
+  bool raw_ret = gst_type_find_register (plugin == null ? IntPtr.Zero : plugin.Handle, native_name, rank, func_wrapper.NativeDelegate, native_extensions, possible_caps == null ? IntPtr.Zero : possible_caps.Handle, IntPtr.Zero, IntPtr.Zero);
   bool ret = raw_ret;
   GLib.Marshaller.Free (native_name);
+  GLib.Marshaller.Free (native_extensions);
   return ret;
 }