diff --git a/urdf2webots/importer.py b/urdf2webots/importer.py
index 0d5b18c..41aa486 100755
--- a/urdf2webots/importer.py
+++ b/urdf2webots/importer.py
@@ -115,7 +115,7 @@ def convertUrdfContent(input, output=None, robotName=None, normal=False, boxColl
 
     if not isinstance(initTranslation, str) or len(initTranslation.split()) != 3:
         sys.exit('--translation argument is not valid. It has to be of Type = str and contain 3 values.')
-    if not isinstance(nitRotation, str) or len(initRotation.split()) != 4:
+    if not isinstance(initRotation, str) or len(initRotation.split()) != 4:
         sys.exit('--rotation argument is not valid. It has to be of Type = str and contain 4 values.')
     if initPos is not None:
         try: