diff --git a/desktop_version/src/GraphicsUtil.cpp b/desktop_version/src/GraphicsUtil.cpp
index 30397f3f..221fe2c0 100644
--- a/desktop_version/src/GraphicsUtil.cpp
+++ b/desktop_version/src/GraphicsUtil.cpp
@@ -316,6 +316,7 @@ void BlitSurfaceTinted(
 }
 
 
+int oldscrollamount = 0;
 int scrollamount = 0;
 bool isscrolling = 0;
 
@@ -326,12 +327,14 @@ void UpdateFilter()
         isscrolling = true;
     }
 
+    oldscrollamount = scrollamount;
     if(isscrolling == true)
     {
         scrollamount += 20;
         if(scrollamount > 240)
         {
             scrollamount = 0;
+            oldscrollamount = 0;
             isscrolling = false;
         }
     }
@@ -348,7 +351,7 @@ SDL_Surface* ApplyFilter( SDL_Surface* _src )
     {
         for(int y = 0; y < _src->h; y++)
         {
-            int sampley = (y + scrollamount )% 240;
+            int sampley = (y + (int) graphics.lerp(oldscrollamount, scrollamount) )% 240;
 
             Uint32 pixel = ReadPixel(_src, x,sampley);