diff --git a/pySim/transport/__init__.py b/pySim/transport/__init__.py
index 9cd23d03..4b932cdc 100644
--- a/pySim/transport/__init__.py
+++ b/pySim/transport/__init__.py
@@ -101,5 +101,5 @@ class LinkBase(object):
 				sw_masked = sw_masked + rv[1][i].lower()
 
 		if sw.lower() != sw_masked:
-			raise RuntimeError("SW match failed ! Expected %s and got %s." % (sw.lower(), rv[1]))
+			raise RuntimeError("SW match failed! Expected %s and got %s." % (sw.lower(), rv[1]))
 		return rv