diff --git a/tools/check_output_test.py b/tools/check_output_test.py
index c8b01952d1..84bc315804 100755
--- a/tools/check_output_test.py
+++ b/tools/check_output_test.py
@@ -27,9 +27,11 @@ def check_output_test(deno_exe_filename):
             expected_out = f.read()
         cmd = [deno_exe_filename, script_abs]
         print " ".join(cmd)
-        actual_out = subprocess.check_output(cmd)
+        actual_out = subprocess.check_output(cmd, universal_newlines=True)
         if expected_out != actual_out:
             print "Expected output does not match actual."
+            print "Expected: " + expected_out
+            print "Actual:   " + actual_out
             sys.exit(1)