diff --git a/src/propertywatchimpl.hpp b/src/propertywatchimpl.hpp
index 43875b9..9fe57d5 100644
--- a/src/propertywatchimpl.hpp
+++ b/src/propertywatchimpl.hpp
@@ -146,7 +146,8 @@
             continue;
         }
 
-        std::get<2>(item->second).get() = p.second.template get<T>();
+        std::get<0>(std::get<2>(item->second).get()) =
+                p.second.template get<T>();
 
         // Invoke callback if present.
         this->callback(Context::SIGNAL);