diff --git a/src/game/Unit.cpp b/src/game/Unit.cpp
index d84332d47..6d75a44d8 100644
--- a/src/game/Unit.cpp
+++ b/src/game/Unit.cpp
@@ -93,7 +93,7 @@ void MovementInfo::Read(ByteBuffer &data)
         data >> t_time;
         data >> t_seat;
 
-        if(moveFlags2 & MOVEFLAG2_UNK1)
+        if(moveFlags2 & MOVEFLAG2_INTERP_MOVEMENT)
             data >> t_time2;
     }
 
@@ -138,7 +138,7 @@ void MovementInfo::Write(ByteBuffer &data) const
         data << t_time;
         data << t_seat;
 
-        if(moveFlags2 & MOVEFLAG2_UNK1)
+        if(moveFlags2 & MOVEFLAG2_INTERP_MOVEMENT)
             data << t_time2;
     }