1 files changed, 1 insertions, 0 deletions
diff --git a/structs.go b/structs.go
index dd9ed14..4e72e80 100644
--- a/structs.go
+++ b/structs.go
@@ -138,6 +138,7 @@ type dropdown struct {
 
 // settings for the dropdown window
 type internalTK struct {
+	once     sync.Once  // for init
 	tk       *guiWidget // where to show STDOUT
 	callerTK *guiWidget // which widget called the dropdown menu
 	wId      int        // the widget id to use