diff --git a/src/Memory/BorrowedPtr.hpp b/src/Memory/BorrowedPtr.hpp
index bfca5b7..52a0e1b 100644
--- a/src/Memory/BorrowedPtr.hpp
+++ b/src/Memory/BorrowedPtr.hpp
@@ -30,7 +30,16 @@ namespace ArbUt {
             return _raw;
         }
 
-        inline typename std::enable_if<!std::is_abstract<T>::value, bool>::type operator*() const {
+        template <typename TValue> struct is_complete_helper {
+            template <typename U> static auto test(U*) -> std::integral_constant<bool, sizeof(U) == sizeof(U)>;
+            static auto test(...) -> std::false_type;
+            using type = decltype(test((TValue*)0));
+        };
+
+        template <typename TValue> struct is_complete : is_complete_helper<TValue>::type {};
+
+        inline typename std::enable_if<is_complete<T>::value && !std::is_abstract<T>::value, bool>::type
+        operator*() const {
             AssertNotNull(_raw);
             return *_raw;
         }