diff --git a/materialviewpager/src/main/java/com/github/florent37/materialviewpager/MaterialViewPagerAnimator.java b/materialviewpager/src/main/java/com/github/florent37/materialviewpager/MaterialViewPagerAnimator.java
index 49487888..36f90033 100644
--- a/materialviewpager/src/main/java/com/github/florent37/materialviewpager/MaterialViewPagerAnimator.java
+++ b/materialviewpager/src/main/java/com/github/florent37/materialviewpager/MaterialViewPagerAnimator.java
@@ -143,6 +143,8 @@ private void setScrollOffset(Object scroll, float yOffset) {
         }
     }
 
+    float initialDistance = -1;
+
     /**
      * Called when a scroller(RecyclerView/ListView,ScrollView,WebView) scrolled by the user
      *
@@ -179,6 +181,13 @@ public void onMaterialScrolled(Object source, float yOffset) {
 
         float percent = yOffset / scrollMax;
 
+        if(initialDistance == -1)
+            initialDistance = mHeader.mPagerSlidingTabStrip.getTop() - mHeader.toolbar.getBottom();
+
+        float newDistance = ViewHelper.getY(mHeader.mPagerSlidingTabStrip) - mHeader.toolbar.getBottom();
+
+        percent = 1 - newDistance/initialDistance;
+
         percent = minMax(0, percent, 1);
         {