diff --git a/include/wx/object.h b/include/wx/object.h
index 88fe417365..da5f418eb6 100644
--- a/include/wx/object.h
+++ b/include/wx/object.h
@@ -534,7 +534,7 @@ public:
         return *this;
     }
 
-    bool IsKindOf(wxClassInfo *info) const;
+    bool IsKindOf(const wxClassInfo *info) const;
 
 
     // Turn on the correct set of new and delete operators
diff --git a/src/common/object.cpp b/src/common/object.cpp
index 247c365f66..67e60c8551 100644
--- a/src/common/object.cpp
+++ b/src/common/object.cpp
@@ -97,9 +97,9 @@ const bool wxFalse = false;
 // E.g. is wxWindow a kind of wxObject?
 // Go from this class to superclass, taking into account
 // two possible base classes.
-bool wxObject::IsKindOf(wxClassInfo *info) const
+bool wxObject::IsKindOf(const wxClassInfo *info) const
 {
-    wxClassInfo *thisInfo = GetClassInfo();
+    const wxClassInfo *thisInfo = GetClassInfo();
     return (thisInfo) ? thisInfo->IsKindOf(info) : false ;
 }