diff --git a/atom/src/observer.h b/atom/src/observer.h
index e6e9911a..fc0fcd3d 100644
--- a/atom/src/observer.h
+++ b/atom/src/observer.h
@@ -48,6 +48,12 @@ struct Observer
         return (m_change_types & change_types) != 0;
     }
 
+    inline void replace( const cppy::ptr& observer, uint8_t change_types )
+    {
+        m_observer = observer;
+        m_change_types = change_types;
+    }
+
     cppy::ptr m_observer;
     uint8_t m_change_types;
 
diff --git a/atom/src/observerpool.cpp b/atom/src/observerpool.cpp
index f861b852..d7dd4abe 100644
--- a/atom/src/observerpool.cpp
+++ b/atom/src/observerpool.cpp
@@ -129,17 +129,17 @@ ObserverPool::add( cppy::ptr& topic, cppy::ptr& observer, uint8_t change_types )
             }
             if( obs_free == obs_end )
             {
-                m_observers.insert( obs_end, Observer( observer, change_types ) );
+                m_observers.emplace( obs_end, observer, change_types );
                 ++topic_it->m_count;
             }
             else
-                *obs_free = Observer( observer, change_types );
+                obs_free->replace( observer, change_types );
             return;
         }
         obs_offset += topic_it->m_count;
     }
-    m_topics.push_back( Topic( topic, 1 ) );
-    m_observers.push_back( Observer(observer, change_types) );
+    m_topics.emplace_back( topic, 1 );
+    m_observers.emplace_back( observer, change_types );
 }