diff --git a/scripts/cslightcrv.py b/scripts/cslightcrv.py
index 66450e2..4c5ac2d 100755
--- a/scripts/cslightcrv.py
+++ b/scripts/cslightcrv.py
@@ -480,7 +480,7 @@ class cslightcrv(ctools.cscript):
                 obs = bin.obs()
                 
                 # Set precomputed binned response
-                obs[0].response(expcube.expcube(), psfcube.psfcube(), bkgcube.cube())
+                obs[0].response(expcube.expcube(), psfcube.psfcube(), bkgcube.bkgcube())
 
                 # Get new models
                 models = bkgcube.models()
diff --git a/scripts/csspec.py b/scripts/csspec.py
index ba8692b..15c97e4 100755
--- a/scripts/csspec.py
+++ b/scripts/csspec.py
@@ -424,7 +424,7 @@ class csspec(ctools.cscript):
                 obs = bin.obs()
                 
                 # Set precomputed binned response
-                obs[0].response(expcube.expcube(), psfcube.psfcube(), bkgcube.cube())
+                obs[0].response(expcube.expcube(), psfcube.psfcube(), bkgcube.bkgcube())
 
                 # Get new models
                 models = bkgcube.models()