diff --git a/cscripts/csiactobs.py b/cscripts/csiactobs.py
index 4d13629..917ed3e 100755
--- a/cscripts/csiactobs.py
+++ b/cscripts/csiactobs.py
@@ -80,7 +80,7 @@ class csiactobs(ctools.cscript):
 
         # Initialise application by calling the appropriate class constructor
         self._init_cscript(argv)
-        
+
         # Append an observation list to XML instance
         self._xml.append(gammalib.GXmlElement('observation_list title="observation list"'))
         self._xml_obslist = self._xml.element('observation_list', 0)
diff --git a/test/test_csiactobs.py b/test/test_csiactobs.py
index a55bfde..2a99389 100755
--- a/test/test_csiactobs.py
+++ b/test/test_csiactobs.py
@@ -148,7 +148,7 @@ class Test(test):
 
         # Check empty observation definition XML file
         self._check_obsdef('csiactobs_obs_py0.xml', 0)
-        
+
         # Check empty model definition XML file
         self._check_moddef('csiactobs_bgd_py0.xml', 0)