diff --git a/cscripts/cssrcdetect.py b/cscripts/cssrcdetect.py
index 2d78f6f..42c662b 100755
--- a/cscripts/cssrcdetect.py
+++ b/cscripts/cssrcdetect.py
@@ -38,12 +38,6 @@ class cssrcdetect(ctools.cscript):
         """
         Constructor
         """
-        # Initialise application by calling the base class constructor
-        self._init_cscript(self.__class__.__name__, ctools.__version__, argv)
-
-        # Set protected members
-        self._models = gammalib.GModels()
-
         # Initialise sky map from constructor arguments
         if len(argv) > 0 and isinstance(argv[0], gammalib.GSkyMap):
             self._map = argv[0]
@@ -51,6 +45,12 @@ class cssrcdetect(ctools.cscript):
         else:
             self._map = gammalib.GSkyMap()
 
+        # Initialise application by calling the base class constructor
+        self._init_cscript(self.__class__.__name__, ctools.__version__, argv)
+
+        # Set protected members
+        self._models = gammalib.GModels()
+
         # Initialise other members
         self._map_dirs = []