diff --git a/src/univ/listbox.cpp b/src/univ/listbox.cpp
index f0f783992a..9a519bcc22 100644
--- a/src/univ/listbox.cpp
+++ b/src/univ/listbox.cpp
@@ -127,6 +127,8 @@ bool wxListBox::Create(wxWindow *parent,
 
 wxListBox::~wxListBox()
 {
+    // call this just to free the client data -- and avoid leaking memory
+    DoClear();
 }
 
 // ----------------------------------------------------------------------------