diff --git a/test/server/Test.interface.yaml b/test/server/Test.interface.yaml
index ac36b84..30df1f9 100644
--- a/test/server/Test.interface.yaml
+++ b/test/server/Test.interface.yaml
@@ -14,5 +14,11 @@
           - const
     - name: Countable
       type: size
+    - name: SignedCountable
+      type: ssize
+    - name: UnsignedInt32
+      type: uint32
+    - name: UnsignedInt64
+      type: uint64
     - name: ObjectPath
       type: object_path