diff --git a/include/connection.h b/include/connection.h
index 7e2793c..eb65919 100644
--- a/include/connection.h
+++ b/include/connection.h
@@ -168,9 +168,9 @@ public:
     }
 
     /**
-    *  Retrieve the heartbeat delay used by this connection
-    *  @return uint16_t
-    */
+     *  Retrieve the heartbeat delay used by this connection
+     *  @return uint16_t
+     */
     uint16_t heartbeat() const
     {
         return _implementation.heartbeat();
diff --git a/include/connectionimpl.h b/include/connectionimpl.h
index 5a6c309..1857a32 100644
--- a/include/connectionimpl.h
+++ b/include/connectionimpl.h
@@ -98,9 +98,9 @@ protected:
     std::queue<OutBuffer> _queue;
 
     /**
-    *  Heartbeat delay
-    *  @var uint16_t
-    */
+     *  Heartbeat delay
+     *  @var uint16_t
+     */
     uint16_t _heartbeat = 0;
 
     /**
@@ -360,7 +360,7 @@ public:
     /**
      *  Heartbeat delay
      *  @return uint16_t
-    */
+     */
     uint16_t heartbeat() const
     {
         return _heartbeat;