diff --git a/src/HomeSpan.h b/src/HomeSpan.h
index 3dbe3c3..76ab8b3 100644
--- a/src/HomeSpan.h
+++ b/src/HomeSpan.h
@@ -833,7 +833,7 @@ class SpanButton : public PushButton {
 
 ///////////////////////////////
 
-class SpanToggle : SpanButton {
+class SpanToggle : public SpanButton {
 
   public: