diff --git a/include/wx/gtk/tglbtn.h b/include/wx/gtk/tglbtn.h
index 1a76c9fae1..f3ddd49404 100644
--- a/include/wx/gtk/tglbtn.h
+++ b/include/wx/gtk/tglbtn.h
@@ -23,7 +23,7 @@ class wxToggleButton;
 // global data
 //-----------------------------------------------------------------------------
 
-extern const char *wxCheckBoxNameStr;
+extern const wxChar *wxCheckBoxNameStr;
 
 //-----------------------------------------------------------------------------
 // wxToggleButton
diff --git a/include/wx/gtk1/tglbtn.h b/include/wx/gtk1/tglbtn.h
index 1a76c9fae1..f3ddd49404 100644
--- a/include/wx/gtk1/tglbtn.h
+++ b/include/wx/gtk1/tglbtn.h
@@ -23,7 +23,7 @@ class wxToggleButton;
 // global data
 //-----------------------------------------------------------------------------
 
-extern const char *wxCheckBoxNameStr;
+extern const wxChar *wxCheckBoxNameStr;
 
 //-----------------------------------------------------------------------------
 // wxToggleButton