diff --git a/test_prw.py b/test_prw.py
index be6c14d6053bf415ea7c310545f9579d5710d85d..7df072909b8a3e9dfd47a6843fed5ec11ff769cf 100644
--- a/test_prw.py
+++ b/test_prw.py
@@ -7,7 +7,7 @@ import re
 rangeSize = 10
 outFname = "output.txt"
 errFname = "err.txt"
-errRegex='prw arg \d+ pid \d+'
+errRegex=r'prw arg \d+ pid \d+'
 
 
 def raiseOrWork(arg):
@@ -24,7 +24,7 @@ def verifyOutput():
     ok=True
     with open(outFname, 'r') as f:
         for line in f.read():
-            if(re.match('\d*',line) is None) :
+            if(re.match(r'\d*',line) is None) :
                 ok=False
     assert ok
 
@@ -54,6 +54,6 @@ def testNoErrFile():
 
 def testRaise():
     from pytest import raises
-    with raises(Exception, match=r''+errRegex):
+    with raises(Exception, match=errRegex):
         prw.parallelRunAndWrite(raiseOrWork, range(rangeSize), outFname)
     verifyFiles()