diff --git a/components/lazcontrols/spinex.pp b/components/lazcontrols/spinex.pp
index b267d85bfc..7cddfcbdc9 100644
--- a/components/lazcontrols/spinex.pp
+++ b/components/lazcontrols/spinex.pp
@@ -109,6 +109,7 @@ type
     FMinValue: T;
     FInitialValue: T;
     FMinRepeatValue: Byte;
+    FMustSetModifiedToTrueInOnChange: Boolean;
     FNullValue: T;
     FNullValueBehaviour: TNullValueBehaviour;
     FValue: T;