diff --git a/src/gtk/choice.cpp b/src/gtk/choice.cpp
index ef4a9e61d1..69ca481174 100644
--- a/src/gtk/choice.cpp
+++ b/src/gtk/choice.cpp
@@ -373,6 +373,8 @@ void wxChoice::SetString(unsigned int n, const wxString& str)
             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 
             gtk_label_set_text( label, wxGTK_CONV( str ) );
+            
+            InvalidateBestSize();
 
             return;
         }