diff --git a/ihatemoney/tests/tests.py b/ihatemoney/tests/tests.py
index 6da06114..84b212a2 100644
--- a/ihatemoney/tests/tests.py
+++ b/ihatemoney/tests/tests.py
@@ -2250,7 +2250,7 @@ class ModelsTestCase(IhatemoneyTestCase):
 
 def em_surround(string, regex_escape=False):
     if regex_escape:
-        return '<em class="font-italic">%s<\/em>' % string
+        return r'<em class="font-italic">%s<\/em>' % string
     else:
         return '<em class="font-italic">%s</em>' % string