diff --git a/include/IECore/TypeIds.h b/include/IECore/TypeIds.h
index 28883e12b2..f6e0720459 100644
--- a/include/IECore/TypeIds.h
+++ b/include/IECore/TypeIds.h
@@ -285,8 +285,8 @@ enum TypeId
 	FirstCoreMayaTypeId = 109000,
 	LastCoreMayaTypeId = 109999,
 
-	FirstGafferTypeId = 110000,
-	LastGafferTypeId = 110999,
+	OldFirstGafferTypeId = 110000, // Used by Gaffer 1.5 and earlier
+	OldLastGafferTypeId = 110999,
 
 	FirstCoreHoudiniTypeId = 111000,
 	LastCoreHoudiniTypeId = 111999,
@@ -309,6 +309,9 @@ enum TypeId
 	FirstCoreVDBTypeId = 117000,
 	LastCoreVDBTypeId = 117999,
 
+	FirstGafferTypeId = 118000, // Used by Gaffer 1.6 and later
+	LastGafferTypeId = 127999,
+
 	// TypeIds dynamically allocated by registerRunTimeTyped (IECore Python)
 	FirstDynamicTypeId = 300000,
 	LastDynamicTypeId = 399999,