diff --git a/source/poodinis/factory.d b/source/poodinis/factory.d
index 05085c5..ff816d0 100644
--- a/source/poodinis/factory.d
+++ b/source/poodinis/factory.d
@@ -167,7 +167,7 @@ class ConstructorInjectingInstanceFactory(InstanceType) : InstanceFactory
                 argumentList ~= ",";
             }
 
-            argumentList ~= "container.resolve!" ~ param.stringof;
+            argumentList ~= "container.resolve!(" ~ param.stringof ~ ")";
         }
         return argumentList;
     }