diff --git a/src/Spring/Spring.Core/Proxy/CompositionProxyTypeBuilder.cs b/src/Spring/Spring.Core/Proxy/CompositionProxyTypeBuilder.cs
index 8e9ad773..26717afd 100644
--- a/src/Spring/Spring.Core/Proxy/CompositionProxyTypeBuilder.cs
+++ b/src/Spring/Spring.Core/Proxy/CompositionProxyTypeBuilder.cs
@@ -197,8 +197,8 @@ namespace Spring.Proxy
             {
                 il.Emit(OpCodes.Ldarg_S, i);
             }
-            il.Emit(OpCodes.Newobj, TargetType.GetConstructor(
-                ReflectionUtils.GetParameterTypes(constructor.GetParameters())));
+
+            il.Emit(OpCodes.Newobj, constructor);
             il.Emit(OpCodes.Stfld, targetInstance);
         }
 
diff --git a/test/Spring/Spring.Core.Tests/Objects/ClassWithProtectedCtor.cs b/test/Spring/Spring.Core.Tests/Objects/ClassWithProtectedCtor.cs
new file mode 100644
index 00000000..82005da0
--- /dev/null
+++ b/test/Spring/Spring.Core.Tests/Objects/ClassWithProtectedCtor.cs
@@ -0,0 +1,13 @@
+namespace Spring.Objects
+{
+    public class ClassWithProtectedCtor : IOther
+    {
+        protected ClassWithProtectedCtor()
+        {
+        }
+
+        public void Absquatulate()
+        {                
+        }
+    }
+}
\ No newline at end of file