diff --git a/include/wx/univ/combobox.h b/include/wx/univ/combobox.h
index a2d9292430..78bdc7059a 100644
--- a/include/wx/univ/combobox.h
+++ b/include/wx/univ/combobox.h
@@ -147,11 +147,7 @@ public:
 
     // we delegate our client data handling to wxListBox which we use for the
     // items, so override this and other methods dealing with the client data
-    virtual wxClientDataType GetClientDataType() const
-    {
-        return GetLBox()->GetClientDataType();
-    }
-
+    virtual wxClientDataType GetClientDataType() const;
     virtual void SetClientDataType(wxClientDataType clientDataItemsType);
 
 protected:
diff --git a/src/univ/combobox.cpp b/src/univ/combobox.cpp
index 21adf5f74d..2656c76d15 100644
--- a/src/univ/combobox.cpp
+++ b/src/univ/combobox.cpp
@@ -427,6 +427,11 @@ wxString wxComboBox::GetStringSelection() const
     return GetLBox()->GetStringSelection();
 }
 
+wxClientDataType wxComboBox::GetClientDataType() const
+{
+    return GetLBox()->GetClientDataType();
+}
+
 void wxComboBox::SetClientDataType(wxClientDataType clientDataItemsType)
 {
     GetLBox()->SetClientDataType(clientDataItemsType);