diff --git a/scripts/cspull.py b/scripts/cspull.py
index 801ec78..c5a4fd8 100755
--- a/scripts/cspull.py
+++ b/scripts/cspull.py
@@ -302,7 +302,7 @@ class cspull(GApplication):
 			model_name = model.name()
 			for k in range(model.size()):
 				par = model[k]
-				if par.isfree():
+				if par.is_free():
 				
 					# Set parameter name
 					name = model_name+"_"+par.name()
diff --git a/scripts/cstsdist.py b/scripts/cstsdist.py
index eb64f11..8cc2cea 100755
--- a/scripts/cstsdist.py
+++ b/scripts/cstsdist.py
@@ -477,7 +477,7 @@ class cstsdist(GApplication):
 			model_name = model.name()
 			for k in range(model.size()):
 				par = model[k]
-				if par.isfree():
+				if par.is_free():
 				
 					# Set parameter name
 					name = model_name+"_"+par.name()
diff --git a/src/ctobssim/ctobssim.cpp b/src/ctobssim/ctobssim.cpp
index 4c87a11..a7bc036 100644
--- a/src/ctobssim/ctobssim.cpp
+++ b/src/ctobssim/ctobssim.cpp
@@ -898,7 +898,7 @@ void ctobssim::simulate_background(GCTAObservation* obs,
 
             // If we have a data model that applies to CTA then simulate
             // events
-            if (model != NULL && model->isvalid("CTA", "")) {
+            if (model != NULL && model->is_valid("CTA", "")) {
 
                 // Get simulated CTA event list. Note that this method
                 // includes the deadtime correction.