diff --git a/src/ctprob/ctprob.cpp b/src/ctprob/ctprob.cpp
index 5f00af7..14d8f8f 100644
--- a/src/ctprob/ctprob.cpp
+++ b/src/ctprob/ctprob.cpp
@@ -223,7 +223,7 @@ void ctprob::run(void)
     log_observations(NORMAL, m_obs, "Input observation");
 
     // Write header into logger
-    log_header1(TERSE, "Event selection");
+    log_header1(TERSE, "Event probability evaluation");
 
     // Initialise counters
     int n_observations = 0;
@@ -280,7 +280,7 @@ void ctprob::run(void)
         // Fall through in case that the event file is empty
         if (obs->events()->size() == 0) {
             log_string(NORMAL, " Warning: No events in event file \""+
-                       m_infiles[i]+"\". Event selection skipped.");
+                       m_infiles[i]+"\". Event probability evaluation skipped.");
             continue;
         }
 
diff --git a/test/test_ctprob.py b/test/test_ctprob.py
index d8f5666..9833684 100755
--- a/test/test_ctprob.py
+++ b/test/test_ctprob.py
@@ -171,6 +171,27 @@ class Test(test):
         except ValueError:
             self.test_try_success()
 
+
+        # Setup ctprob with a list of observations and test prefix
+        prob = ctools.ctprob()
+        prob['inobs']  = self._datadir + '/obs_unbinned.xml'
+        prob['prefix'] = 'ctprob_py3_'
+        prob['outobs']  = 'ctprob_py3_obs.xml'
+        prob['inmodel']  = self._model
+        prob['caldb']  = self._caldb
+        prob['irf']  = self._irf
+        prob['edisp']  = True
+        prob['logfile'] = 'ctprob_py3.log'
+        prob['chatter'] = 3
+
+        # Run ctprob tool
+        prob.logFileOpen()   # Make sure we get a log file
+        prob.run()
+        prob.save()
+
+        # Check result file
+        self._check_result_file('ctprob_py3_crab_events.fits')
+
         # Return
         return