1 files changed, 1 insertions, 1 deletions

diff --git a/include/opkele/iterator.h b/include/opkele/iterator.h
index 8f86234..94da7e4 100644
--- a/include/opkele/iterator.h
+++ b/include/opkele/iterator.h
@@ -94,25 +94,25 @@ namespace opkele {
         class forward_iterator_proxy : public iterator<forward_iterator_tag,T,void,TP,TR> {
             public:
                 basic_forward_iterator_proxy_impl<T,TR,TP> *I;
 
                 template<typename IT>
                     forward_iterator_proxy(const IT& i)
                     : I(new forward_iterator_proxy_impl<IT>(i)) { }
                 forward_iterator_proxy(const forward_iterator_proxy<T,TR,TP>& x)
                     : I(x.I->dup()) { }
                 ~forward_iterator_proxy() { delete I; }
 
                 forward_iterator_proxy& operator=(const forward_iterator_proxy<T,TR,TP>& x) {
-                    delete I; I = x.I->dup(); }
+                    delete I; I = x.I->dup(); return *this; }
 
                 bool operator==(const forward_iterator_proxy<T,TR,TP>& x) const {
                     return (*I)==(*(x.I)); }
                 bool operator!=(const forward_iterator_proxy<T,TR,TP>& x) const {
                     return (*I)!=(*(x.I)); }
 
                 TR operator*() const {
                     return **I; }
                 TP operator->() const {
                     return I->operator->(); }
 
                 forward_iterator_proxy<T,TR,TP>& operator++() {