diff --git a/videocr/video.py b/videocr/video.py
index a3c86de..e4b7565 100644
--- a/videocr/video.py
+++ b/videocr/video.py
@@ -62,7 +62,7 @@ class Video:
             # only use bottom half of the frame by default
             img = img[self.height // 2:, :]
         # dilate and resize
-        img=cv2.resize(cv2.dilate(img, np.ones(2, 2), np.uint8), self.resize_dim, interpolation=cv2.INTER_AREA)
+        img=cv2.resize(cv2.dilate(img, np.ones((2, 2), np.uint8)), self.resize_dim, interpolation=cv2.INTER_AREA)
 
         # mask to filter out non gray-like pixels/pixels that are not bright enough
         hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)