--- a/boost/gil/gil_concept.hpp
+++ b/boost/gil/gil_concept.hpp
@@ -456,11 +456,12 @@ namespace detail {
     template <typename T>
     struct ChannelIsMutableConcept {
         void constraints() {
-            c=c;
+            c1=c2;
             using std::swap;
-            swap(c,c);
+            swap(c1,c2);
         }
-        T c;
+        T c1;
+        T c2;
     };
 }
 
@@ -951,9 +952,10 @@ struct MutableHomogeneousPixelConcept {
     void constraints() {
         gil_function_requires<HomogeneousPixelConcept<P> >();
         gil_function_requires<MutableHomogeneousColorBaseConcept<P> >();
-        p[0]=p[0];
+        p[0]=v;
     }
     P p;
+    typename P::template element_type<P>::type v;
 };
 
 /// \brief Pixel concept that is a Regular type