diff --git a/generator/InterfaceGen.cs b/generator/InterfaceGen.cs
index 6d1185223..c6cecdf16 100644
--- a/generator/InterfaceGen.cs
+++ b/generator/InterfaceGen.cs
@@ -197,12 +197,23 @@ namespace GtkSharp.Generation {
 			m.GenerateImport (sw);
 			sw.WriteLine ("\t\tprivate static GLib.GType _gtype = new GLib.GType ({0} ());", m.CName);
 			sw.WriteLine ();
-			sw.WriteLine ("\t\tpublic override GLib.GType GType {");
+
+			// by convention, all GTypes generated have a static GType property
+			sw.WriteLine ("\t\tpublic static GLib.GType GType {");
 			sw.WriteLine ("\t\t\tget {");
 			sw.WriteLine ("\t\t\t\treturn _gtype;");
 			sw.WriteLine ("\t\t\t}");
 			sw.WriteLine ("\t\t}");
 			sw.WriteLine ();
+
+			// we need same property but non-static, because it is being accessed via a GInterfaceAdapter instance
+			sw.WriteLine ("\t\tpublic override GLib.GType GInterfaceGType {");
+			sw.WriteLine ("\t\t\tget {");
+			sw.WriteLine ("\t\t\t\treturn _gtype;");
+			sw.WriteLine ("\t\t\t}");
+			sw.WriteLine ("\t\t}");
+
+			sw.WriteLine ();
 		}
 
 		void GenerateHandleProp (StreamWriter sw)
diff --git a/glib/GInterfaceAdapter.cs b/glib/GInterfaceAdapter.cs
index ab71f6829..f86636711 100644
--- a/glib/GInterfaceAdapter.cs
+++ b/glib/GInterfaceAdapter.cs
@@ -50,7 +50,7 @@ namespace GLib {
 			}
 		}
 
-		public abstract GType GType { get; }
+		public abstract GType GInterfaceGType { get; }
 
 		public abstract IntPtr Handle { get; }
 
diff --git a/glib/Object.cs b/glib/Object.cs
index c1ed9642c..74994813e 100644
--- a/glib/Object.cs
+++ b/glib/Object.cs
@@ -225,7 +225,7 @@ namespace GLib {
 					if (!iface.IsAssignableFrom (Type.BaseType)) {
 						GInterfaceInfo info = adapter.Info;
 						info.Data = gtype.Val;
-						g_type_add_interface_static (gtype.Val, adapter.GType.Val, ref info);
+						g_type_add_interface_static (gtype.Val, adapter.GInterfaceGType.Val, ref info);
 						adapters.Add (adapter);
 					}
 				}
@@ -341,7 +341,7 @@ namespace GLib {
 						PropertyInfo declared_prop = Type.GetProperty (p.Name, BindingFlags.Public | BindingFlags.Instance);
 						if (declared_prop == null)
 							continue;
-						IntPtr param_spec = FindInterfaceProperty (adapter.GType, property_attr.Name);
+						IntPtr param_spec = FindInterfaceProperty (adapter.GInterfaceGType, property_attr.Name);
 
 						Dictionary<IntPtr, PropertyInfo> props;
 						if (!Properties.TryGetValue (Type, out props)) {
diff --git a/glib/Value.cs b/glib/Value.cs
index 1c89cc37d..9b8b93745 100755
--- a/glib/Value.cs
+++ b/glib/Value.cs
@@ -134,7 +134,7 @@ namespace GLib {
 			g_value_set_object (ref this, val == null ? IntPtr.Zero : val.Handle);
 		}
 
-		public Value (GLib.GInterfaceAdapter val) : this (val == null ? GType.Object : val.GType)
+		public Value (GLib.GInterfaceAdapter val) : this (val == null ? GType.Object : val.GInterfaceGType)
 		{
 			g_value_set_object (ref this, val == null ? IntPtr.Zero : val.Handle);
 		}