diff --git a/src/motif/scrolbar.cpp b/src/motif/scrolbar.cpp
index bb3f97a8d2..79662ae942 100644
--- a/src/motif/scrolbar.cpp
+++ b/src/motif/scrolbar.cpp
@@ -130,7 +130,7 @@ static void wxScrollBarCallback(Widget widget, XtPointer clientData,
                                 XmScaleCallbackStruct *cbs)
 {
     wxScrollBar *scrollBar = (wxScrollBar*)wxGetWindowFromTable(widget);
-    wxOrientation orientation = (wxOrientation)(int)clientData;
+    wxOrientation orientation = (wxOrientation)wxPtrToUInt(clientData);
     wxEventType eventType = wxEVT_NULL;
 
     switch (cbs->reason)
diff --git a/src/motif/window.cpp b/src/motif/window.cpp
index aac080b93a..4d10afdafd 100644
--- a/src/motif/window.cpp
+++ b/src/motif/window.cpp
@@ -2088,7 +2088,7 @@ static void wxScrollBarCallback(Widget scrollbar,
                                 XmScrollBarCallbackStruct *cbs)
 {
     wxWindow *win = wxGetWindowFromTable(scrollbar);
-    wxOrientation orientation = (wxOrientation)(int)clientData;
+    wxOrientation orientation = (wxOrientation)wxPtrToUInt(clientData);
 
     wxEventType eventType = wxEVT_NULL;
     switch (cbs->reason)