diff --git a/pyzebra/app/panel_ccl_integrate.py b/pyzebra/app/panel_ccl_integrate.py
index 61cf587..6980822 100644
--- a/pyzebra/app/panel_ccl_integrate.py
+++ b/pyzebra/app/panel_ccl_integrate.py
@@ -414,7 +414,7 @@ def create():
 
     def fitparams_factory(function):
         if function == "background":
-            params = ["slope", "offset"]
+            params = ["slope", "intercept"]
         elif function == "gauss":
             params = ["center", "sigma", "amplitude"]
         elif function == "voigt":
diff --git a/pyzebra/app/panel_param_study.py b/pyzebra/app/panel_param_study.py
index 796237f..07e1342 100644
--- a/pyzebra/app/panel_param_study.py
+++ b/pyzebra/app/panel_param_study.py
@@ -495,7 +495,7 @@ def create():
 
     def fitparams_factory(function):
         if function == "background":
-            params = ["slope", "offset"]
+            params = ["slope", "intercept"]
         elif function == "gauss":
             params = ["center", "sigma", "amplitude"]
         elif function == "voigt":