diff --git a/extensions/sdktools/vglobals.cpp b/extensions/sdktools/vglobals.cpp
index 685b31582..33cd1e1e4 100644
--- a/extensions/sdktools/vglobals.cpp
+++ b/extensions/sdktools/vglobals.cpp
@@ -263,6 +263,12 @@ const char *GetDTTypeName(int type)
 		{
 			return "datatable";
 		}
+#if SOURCE_ENGINE >= SE_ALIENSWARM
+	case DPT_Int64:
+		{
+			return "int64";
+		}
+#endif
 	default:
 		{
 			return NULL;