diff --git a/src/generic/aboutdlgg.cpp b/src/generic/aboutdlgg.cpp
index 70f1582622..03edc08ab0 100644
--- a/src/generic/aboutdlgg.cpp
+++ b/src/generic/aboutdlgg.cpp
@@ -223,7 +223,8 @@ void wxGenericAboutDialog::AddCollapsiblePane(const wxString& title,
                                               const wxString& text)
 {
     wxCollapsiblePane *pane = new wxCollapsiblePane(this, wxID_ANY, title);
-    wxStaticText *txt = new wxStaticText(pane->GetPane(), wxID_ANY, text,
+    wxWindow * const paneContents = pane->GetPane();
+    wxStaticText *txt = new wxStaticText(paneContents, wxID_ANY, text,
                                          wxDefaultPosition, wxDefaultSize,
                                          wxALIGN_CENTRE);
 
@@ -231,6 +232,12 @@ void wxGenericAboutDialog::AddCollapsiblePane(const wxString& title,
     static const int maxWidth = wxGetDisplaySize().x/3;
     txt->Wrap(maxWidth);
 
+
+    // we need a sizer to make this text expand to fill the entire pane area
+    wxSizer * const sizerPane = new wxBoxSizer(wxHORIZONTAL);
+    sizerPane->Add(txt, wxSizerFlags(1).Expand());
+    paneContents->SetSizer(sizerPane);
+
     // NB: all the wxCollapsiblePanes must be added with a null proportion value
     m_sizerText->Add(pane, wxSizerFlags(0).Expand().Border(wxBOTTOM));
 }