diff --git a/jquery.sticky-kit.coffee b/jquery.sticky-kit.coffee
index fb6f287..121b69d 100644
--- a/jquery.sticky-kit.coffee
+++ b/jquery.sticky-kit.coffee
@@ -24,7 +24,7 @@ $.fn.stick_in_parent = (opts={}) ->
   enable_bottoming = true unless enable_bottoming?
 
   for elm in @
-    ((elm, padding_bottom, parent_top, parent_height, top, height, el_float, detached) ->
+    ((elm, padding_bottom, parent_top, parent_height, top, height, el_float, detached, scroll_height) ->
       return if elm.data "sticky_kit"
       elm.data "sticky_kit", true
 
@@ -49,6 +49,7 @@ $.fn.stick_in_parent = (opts={}) ->
 
         parent_top = parent.offset().top + border_top + padding_top
         parent_height = parent.height()
+        scroll_height = $(document).height() - win.height()
 
         if fixed
           fixed = false
@@ -101,7 +102,7 @@ $.fn.stick_in_parent = (opts={}) ->
 
         scroll = win.scrollTop()
         if last_pos?
-          delta = scroll - last_pos
+          delta = if scroll_height > scroll then scroll - last_pos else 0
         last_pos = scroll
 
         if fixed
diff --git a/jquery.sticky-kit.js b/jquery.sticky-kit.js
index 86029bd..dceda0a 100644
--- a/jquery.sticky-kit.js
+++ b/jquery.sticky-kit.js
@@ -1,4 +1,4 @@
-// Generated by CoffeeScript 1.8.0
+// Generated by CoffeeScript 1.9.0
 
 /**
 @license Sticky-kit v1.1.1 | WTFPL | Leaf Corcoran 2014 | http://leafo.net
@@ -32,7 +32,7 @@
     if (enable_bottoming == null) {
       enable_bottoming = true;
     }
-    _fn = function(elm, padding_bottom, parent_top, parent_height, top, height, el_float, detached) {
+    _fn = function(elm, padding_bottom, parent_top, parent_height, top, height, el_float, detached, scroll_height) {
       var bottomed, detach, fixed, last_pos, offset, parent, recalc, recalc_and_tick, recalc_counter, spacer, tick;
       if (elm.data("sticky_kit")) {
         return;
@@ -61,6 +61,7 @@
         padding_bottom = parseInt(parent.css("padding-bottom"), 10);
         parent_top = parent.offset().top + border_top + padding_top;
         parent_height = parent.height();
+        scroll_height = $(document).height() - win.height();
         if (fixed) {
           fixed = false;
           bottomed = false;
@@ -113,7 +114,7 @@
         }
         scroll = win.scrollTop();
         if (last_pos != null) {
-          delta = scroll - last_pos;
+          delta = scroll_height > scroll ? scroll - last_pos : 0;
         }
         last_pos = scroll;
         if (fixed) {
diff --git a/jquery.sticky-kit.min.js b/jquery.sticky-kit.min.js
index 87f7d57..5bbd9ab 100644
--- a/jquery.sticky-kit.min.js
+++ b/jquery.sticky-kit.min.js
@@ -1,9 +1,9 @@
 /*
  Sticky-kit v1.1.1 | WTFPL | Leaf Corcoran 2014 | http://leafo.net
 */
-(function(){var k,e;k=this.jQuery||window.jQuery;e=k(window);k.fn.stick_in_parent=function(d){var v,y,n,p,h,C,s,G,q,H;null==d&&(d={});s=d.sticky_class;y=d.inner_scrolling;C=d.recalc_every;h=d.parent;p=d.offset_top;n=d.spacer;v=d.bottoming;null==p&&(p=0);null==h&&(h=void 0);null==y&&(y=!0);null==s&&(s="is_stuck");null==v&&(v=!0);G=function(a,d,q,z,D,t,r,E){var u,F,m,A,c,f,B,w,x,g,b;if(!a.data("sticky_kit")){a.data("sticky_kit",!0);f=a.parent();null!=h&&(f=f.closest(h));if(!f.length)throw"failed to find stick parent";
-u=m=!1;(g=null!=n?n&&a.closest(n):k("<div />"))&&g.css("position",a.css("position"));B=function(){var c,e,l;if(!E&&(c=parseInt(f.css("border-top-width"),10),e=parseInt(f.css("padding-top"),10),d=parseInt(f.css("padding-bottom"),10),q=f.offset().top+c+e,z=f.height(),m&&(u=m=!1,null==n&&(a.insertAfter(g),g.detach()),a.css({position:"",top:"",width:"",bottom:""}).removeClass(s),l=!0),D=a.offset().top-(parseInt(a.css("margin-top"),10)||0)-p,t=a.outerHeight(!0),r=a.css("float"),g&&g.css({width:a.outerWidth(!0),
-height:t,display:a.css("display"),"vertical-align":a.css("vertical-align"),"float":r}),l))return b()};B();if(t!==z)return A=void 0,c=p,x=C,b=function(){var b,k,l,h;if(!E&&(null!=x&&(--x,0>=x&&(x=C,B())),l=e.scrollTop(),null!=A&&(k=l-A),A=l,m?(v&&(h=l+t+c>z+q,u&&!h&&(u=!1,a.css({position:"fixed",bottom:"",top:c}).trigger("sticky_kit:unbottom"))),l<D&&(m=!1,c=p,null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.detach()),b={position:"",width:"",top:""},a.css(b).removeClass(s).trigger("sticky_kit:unstick")),
-y&&(b=e.height(),t+p>b&&!u&&(c-=k,c=Math.max(b-t,c),c=Math.min(p,c),m&&a.css({top:c+"px"})))):l>D&&(m=!0,b={position:"fixed",top:c},b.width="border-box"===a.css("box-sizing")?a.outerWidth()+"px":a.width()+"px",a.css(b).addClass(s),null==n&&(a.after(g),"left"!==r&&"right"!==r||g.append(a)),a.trigger("sticky_kit:stick")),m&&v&&(null==h&&(h=l+t+c>z+q),!u&&h)))return u=!0,"static"===f.css("position")&&f.css({position:"relative"}),a.css({position:"absolute",bottom:d,top:"auto"}).trigger("sticky_kit:bottom")},
-w=function(){B();return b()},F=function(){E=!0;e.off("touchmove",b);e.off("scroll",b);e.off("resize",w);k(document.body).off("sticky_kit:recalc",w);a.off("sticky_kit:detach",F);a.removeData("sticky_kit");a.css({position:"",bottom:"",top:"",width:""});f.position("position","");if(m)return null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.remove()),a.removeClass(s)},e.on("touchmove",b),e.on("scroll",b),e.on("resize",w),k(document.body).on("sticky_kit:recalc",w),a.on("sticky_kit:detach",F),setTimeout(b,
-0)}};q=0;for(H=this.length;q<H;q++)d=this[q],G(k(d));return this}}).call(this);
+(function(){var b,l;b=this.jQuery||window.jQuery;l=b(window);b.fn.stick_in_parent=function(d){var n,A,p,q,g,E,u,x,r,I;null==d&&(d={});u=d.sticky_class;A=d.inner_scrolling;E=d.recalc_every;g=d.parent;q=d.offset_top;p=d.spacer;n=d.bottoming;null==q&&(q=0);null==g&&(g=void 0);null==A&&(A=!0);null==u&&(u="is_stuck");null==n&&(n=!0);x=function(a,d,r,B,F,v,t,G,x){var w,H,m,C,c,e,D,y,z,f,h;if(!a.data("sticky_kit")){a.data("sticky_kit",!0);e=a.parent();null!=g&&(e=e.closest(g));if(!e.length)throw"failed to find stick parent";
+w=m=!1;(f=null!=p?p&&a.closest(p):b("<div />"))&&f.css("position",a.css("position"));D=function(){var c,n,k;if(!G&&(c=parseInt(e.css("border-top-width"),10),n=parseInt(e.css("padding-top"),10),d=parseInt(e.css("padding-bottom"),10),r=e.offset().top+c+n,B=e.height(),x=b(document).height()-l.height(),m&&(w=m=!1,null==p&&(a.insertAfter(f),f.detach()),a.css({position:"",top:"",width:"",bottom:""}).removeClass(u),k=!0),F=a.offset().top-(parseInt(a.css("margin-top"),10)||0)-q,v=a.outerHeight(!0),t=a.css("float"),
+f&&f.css({width:a.outerWidth(!0),height:v,display:a.css("display"),"vertical-align":a.css("vertical-align"),"float":t}),k))return h()};D();if(v!==B)return C=void 0,c=q,z=E,h=function(){var b,h,k,g;if(!G&&(null!=z&&(--z,0>=z&&(z=E,D())),k=l.scrollTop(),null!=C&&(h=x>k?k-C:0),C=k,m?(n&&(g=k+v+c>B+r,w&&!g&&(w=!1,a.css({position:"fixed",bottom:"",top:c}).trigger("sticky_kit:unbottom"))),k<F&&(m=!1,c=q,null==p&&("left"!==t&&"right"!==t||a.insertAfter(f),f.detach()),b={position:"",width:"",top:""},a.css(b).removeClass(u).trigger("sticky_kit:unstick")),
+A&&(b=l.height(),v+q>b&&!w&&(c-=h,c=Math.max(b-v,c),c=Math.min(q,c),m&&a.css({top:c+"px"})))):k>F&&(m=!0,b={position:"fixed",top:c},b.width="border-box"===a.css("box-sizing")?a.outerWidth()+"px":a.width()+"px",a.css(b).addClass(u),null==p&&(a.after(f),"left"!==t&&"right"!==t||f.append(a)),a.trigger("sticky_kit:stick")),m&&n&&(null==g&&(g=k+v+c>B+r),!w&&g)))return w=!0,"static"===e.css("position")&&e.css({position:"relative"}),a.css({position:"absolute",bottom:d,top:"auto"}).trigger("sticky_kit:bottom")},
+y=function(){D();return h()},H=function(){G=!0;l.off("touchmove",h);l.off("scroll",h);l.off("resize",y);b(document.body).off("sticky_kit:recalc",y);a.off("sticky_kit:detach",H);a.removeData("sticky_kit");a.css({position:"",bottom:"",top:"",width:""});e.position("position","");if(m)return null==p&&("left"!==t&&"right"!==t||a.insertAfter(f),f.remove()),a.removeClass(u)},l.on("touchmove",h),l.on("scroll",h),l.on("resize",y),b(document.body).on("sticky_kit:recalc",y),a.on("sticky_kit:detach",H),setTimeout(h,
+0)}};r=0;for(I=this.length;r<I;r++)d=this[r],x(b(d));return this}}).call(this);
\ No newline at end of file