diff --git a/Examples/test-suite/template_opaque.i b/Examples/test-suite/template_opaque.i
index 4c981652e..dee5d40ed 100644
--- a/Examples/test-suite/template_opaque.i
+++ b/Examples/test-suite/template_opaque.i
@@ -19,7 +19,7 @@ namespace A {
   
   void FillVector(OpaqueVectorType& v) 
   {
-    for (int i = 0; i < v.size(); ++i) {
+    for (size_t i = 0; i < v.size(); ++i) {
       v[i] = OpaqueStruct();
     }
   }