diff --git a/moviepy/video/fx/scroll.py b/moviepy/video/fx/scroll.py
index 59a285c91..34f4f4012 100644
--- a/moviepy/video/fx/scroll.py
+++ b/moviepy/video/fx/scroll.py
@@ -1,5 +1,3 @@
-import numpy as np
-
 def scroll(clip, h=None, w=None, x_speed=0, y_speed=0,
            x_start=0, y_start=0, apply_to="mask"):
     """ Scrolls horizontally or vertically a clip, e.g. to make end
@@ -11,8 +9,8 @@ def scroll(clip, h=None, w=None, x_speed=0, y_speed=0,
     ymax = clip.h-h-1
 
     def f(gf,t):
-        x = max(0, min(xmax, x_start+ np.round(x_speed*t)))
-        y = max(0, min(ymax, y_start+ np.round(y_speed*t)))
+        x = int(max(0, min(xmax, x_start+ round(x_speed*t))))
+        y = int(max(0, min(ymax, y_start+ round(y_speed*t))))
         return gf(t)[y:y+h, x:x+w]
     
     return clip.fl(f, apply_to = apply_to)
diff --git a/tests/download_media.py b/tests/download_media.py
index 5d735ba2c..0cc75d291 100644
--- a/tests/download_media.py
+++ b/tests/download_media.py
@@ -48,4 +48,6 @@ def download():
 
     download_url("https://raw.githubusercontent.com/earney/moviepy_media/master/tests/misc/traj.txt",
                  "media/traj.txt")
-    
+
+    download_url("https://github.com/earney/moviepy_media/raw/master/tests/images/vacation_2017.jpg",
+                  "media/vacation_2017.jpg")
\ No newline at end of file
diff --git a/tests/test_PR.py b/tests/test_PR.py
index 790c65c42..aba1c3e5b 100644
--- a/tests/test_PR.py
+++ b/tests/test_PR.py
@@ -89,9 +89,19 @@ def test_PR_515():
     clip = VideoFileClip("media/fire2.mp4", fps_source='fps')
     assert clip.fps == 10.51
 
+    
+def test_PR_528():
+    clip = ImageClip("media/vacation_2017.jpg")
+    new_clip = vfx.scroll(clip, w=1000, x_speed=50)
+    new_clip = new_clip.set_duration(20)
+    new_clip.fps = 24
+    new_clip.write_videofile(os.path.join(TMP_DIR, "pano.mp4"))
+    
+
 def test_PR_529():
     video_clip = VideoFileClip("media/fire2.mp4")
     assert video_clip.rotation ==180
 
+
 if __name__ == '__main__':
    pytest.main()