diff --git a/pyphotonfile/photonfile.py b/pyphotonfile/photonfile.py
index 50d67c4..0c8b3fd 100644
--- a/pyphotonfile/photonfile.py
+++ b/pyphotonfile/photonfile.py
@@ -453,7 +453,7 @@ def replace_layer(self, images, idx, layer_thickness=None, exposure_time=None, o
         """
         layer = self.create_layer(images, layer_thickness, exposure_time, off_time)
         self.delete_layer(idx)
-        self.insert_layer(idx, layer)
+        self.layers.insert(idx, layer)
 
     def delete_layer(self, idx):
         """