diff --git a/scan.py b/scan.py
index dfb75d2..4aa835e 100644
--- a/scan.py
+++ b/scan.py
@@ -189,7 +189,7 @@ def get_contour(self, rescaled_image):
 
         # dilate helps to remove potential holes between edge segments
         kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(MORPH,MORPH))
-        dilated = cv2.dilate(gray, kernel)
+        dilated = cv2.morphologyEx(gray, cv2.MORPH_CLOSE, kernel)
 
         # find edges and mark them in the output map using the Canny algorithm
         edged = cv2.Canny(dilated, 0, CANNY)