diff --git a/jacket.nim b/jacket.nim
index 66d0f32..7e3b3de 100644
--- a/jacket.nim
+++ b/jacket.nim
@@ -38,9 +38,9 @@ type
     PortTypeIdT* = culong
 
 type
-    ClientT = object
+    ClientT = distinct object
     ClientTPtr* = ptr ClientT
-    PortT = object
+    PortT = distinct object
     PortTPtr* = ptr PortT