diff --git a/graf2d/gpad/src/TSlider.cxx b/graf2d/gpad/src/TSlider.cxx
index 7599dfa2f300ebe619076399e65e4948397216c3..6b49669a214df472661670f12e2c1a02364bcf04 100644
--- a/graf2d/gpad/src/TSlider.cxx
+++ b/graf2d/gpad/src/TSlider.cxx
@@ -103,8 +103,10 @@ TSlider::TSlider(): TPad()
 {
    // slider default constructor.
 
-   fObject = 0;
-   fMethod = "";
+   fObject  = 0;
+   fMethod  = "";
+   fMinimum = 0;
+   fMaximum = 1;
 }