diff --git a/lcl/grids.pas b/lcl/grids.pas
index a1ab619c06..76ff5c2da8 100644
--- a/lcl/grids.pas
+++ b/lcl/grids.pas
@@ -53,14 +53,14 @@ const
   GRIDFILEVERSION = 3; // Introduced Col/Row FixedAttr and NormalAttr
 
 const
-  GM_SETVALUE   = LM_USER + 100;
-  GM_GETVALUE   = LM_USER + 101;
-  GM_SETGRID    = LM_USER + 102;
-  GM_SETBOUNDS  = LM_USER + 103;
-  GM_SELECTALL  = LM_USER + 104;
-  GM_SETMASK    = LM_USER + 105;
-  GM_SETPOS     = LM_USER + 106;
-  GM_READY      = LM_USER + 107;
+  GM_SETVALUE   = LM_INTERFACELAST + 100;
+  GM_GETVALUE   = LM_INTERFACELAST + 101;
+  GM_SETGRID    = LM_INTERFACELAST + 102;
+  GM_SETBOUNDS  = LM_INTERFACELAST + 103;
+  GM_SELECTALL  = LM_INTERFACELAST + 104;
+  GM_SETMASK    = LM_INTERFACELAST + 105;
+  GM_SETPOS     = LM_INTERFACELAST + 106;
+  GM_READY      = LM_INTERFACELAST + 107;
   
 
 const
diff --git a/lcl/lmessages.pp b/lcl/lmessages.pp
index 3dfd8fb8c9..d7b8856ade 100644
--- a/lcl/lmessages.pp
+++ b/lcl/lmessages.pp
@@ -46,7 +46,7 @@ const
   // RECEIVED from the interface, here are no defines
   // of messages send to the interface
   //-------------
-  LM_USER           = $400; // MWE: changed from $100 to $400 since they were in the windows range
+  LM_USER           = $400; // standard WM_USER value
   WM_USER           = LM_USER;
 
   // reserve some space for LM_USER messages