diff --git a/test/test_cttsmap.py b/test/test_cttsmap.py
index 09ddc3d..3e5c9e7 100755
--- a/test/test_cttsmap.py
+++ b/test/test_cttsmap.py
@@ -67,6 +67,7 @@ class Test(gammalib.GPythonTestSuite):
         """
         # Set-up cttsmap
         tsmap = ctools.cttsmap()
+        tsmap["debug"].boolean(True)
         tsmap["infile"].filename(self.events_name)
         tsmap["srcmdl"].filename(self.model_name)
         tsmap["srcname"].string("Crab")