diff --git a/layout/tools/reftest/runreftest.py b/layout/tools/reftest/runreftest.py
index 50001396e3cf..98b5c83b1fab 100644
--- a/layout/tools/reftest/runreftest.py
+++ b/layout/tools/reftest/runreftest.py
@@ -79,7 +79,7 @@ class RefTest(object):
       if len(thispref) < 2:
         print "Error: syntax error in --setpref=" + v
         sys.exit(1)
-        prefs[thispref[0]] = thispref[1]
+      prefs[thispref[0]] = thispref[1]
 
     # install the reftest extension bits into the profile
     addons = []