diff --git a/ProcessMultipliers/processMultipliers.py b/ProcessMultipliers/processMultipliers.py
index 0b187c36..1c3ad5ce 100755
--- a/ProcessMultipliers/processMultipliers.py
+++ b/ProcessMultipliers/processMultipliers.py
@@ -199,7 +199,7 @@ def checkOutputFolders(self, working_dir, type_mapping):
         :param dict type_mapping: dict of shielding, terrain, topographic
         '''
         dir_check = os.path.isdir(working_dir)
-        if dir_check == False:
+        if dir_check is False:
             os.makedirs(working_dir)
             log.info('Creating directories for outputs')
         else: