diff --git a/pyzebra/app/panel_ccl_integrate.py b/pyzebra/app/panel_ccl_integrate.py
index 179cf72..05e69ee 100644
--- a/pyzebra/app/panel_ccl_integrate.py
+++ b/pyzebra/app/panel_ccl_integrate.py
@@ -422,6 +422,10 @@ def create():
             param=params, value=[None] * n, vary=[True] * n, min=[None] * n, max=[None] * n,
         )
 
+        if function == "linear":
+            fitparams["value"] = [0, 0]
+            fitparams["vary"] = [False, False]
+
         return fitparams
 
     fitparams_table_source = ColumnDataSource(dict(param=[], value=[], vary=[], min=[], max=[]))
diff --git a/pyzebra/app/panel_param_study.py b/pyzebra/app/panel_param_study.py
index 4a66277..4f2f87a 100644
--- a/pyzebra/app/panel_param_study.py
+++ b/pyzebra/app/panel_param_study.py
@@ -516,6 +516,10 @@ def create():
             param=params, value=[None] * n, vary=[True] * n, min=[None] * n, max=[None] * n,
         )
 
+        if function == "linear":
+            fitparams["value"] = [0, 0]
+            fitparams["vary"] = [False, False]
+
         return fitparams
 
     fitparams_table_source = ColumnDataSource(dict(param=[], value=[], vary=[], min=[], max=[]))