diff --git a/src/motif/toplevel.cpp b/src/motif/toplevel.cpp
index 248b5465c1..a3458c64a7 100644
--- a/src/motif/toplevel.cpp
+++ b/src/motif/toplevel.cpp
@@ -118,7 +118,7 @@ bool wxTopLevelWindowMotif::Create( wxWindow *parent, wxWindowID id,
     // Intercept CLOSE messages from the window manager
     Widget shell = (Widget)GetShellWidget();
     Atom WM_DELETE_WINDOW = XmInternAtom( XtDisplay( shell ),
-                                          "WM_DELETE_WINDOW", False );
+                                          (char*)"WM_DELETE_WINDOW", False );
 
     // Remove and add WM_DELETE_WINDOW so ours is only handler
     // This only appears to be necessary for wxDialog, but does not hurt
diff --git a/src/motif/window.cpp b/src/motif/window.cpp
index 023770f093..523ac5afe3 100644
--- a/src/motif/window.cpp
+++ b/src/motif/window.cpp
@@ -2608,7 +2608,7 @@ void wxGetTextExtent(const wxWindow* window, const wxString& str,
     if (table == NULL)
         table = XmeGetDefaultRenderTable(w, XmTEXT_RENDER_TABLE);
 
-    rendition = XmRenderTableGetRendition( table, "" );
+    rendition = XmRenderTableGetRendition( table, (char*)"" );
     XtSetArg( args[count], XmNfont, 0 ); ++count;
     XtSetArg( args[count], XmNfontType, 0 ); ++count;
     XmRenditionRetrieve( rendition, args, count );