diff --git a/zesje/images.py b/zesje/images.py
index 331a7a087864bf90d6d99f4e34aafb8110f75d34..be831e18a78fc25224215ae3bc4eb70cddc4a6eb 100644
--- a/zesje/images.py
+++ b/zesje/images.py
@@ -58,7 +58,7 @@ def fix_corner_markers(corner_keypoints, shape):
         Coordinates of the top left corner marker
     """
 
-    if len(corner_keypoints) == 4 or len(corner_keypoints) < 3:
+    if len(corner_keypoints) < 3:
         raise RuntimeError("Fewer then 3 corner markers found")
 
     x_sep = shape[1] / 2