diff --git a/workspace_tools/host_tests/wfi_auto.py b/workspace_tools/host_tests/wfi_auto.py
index b51beca13f..5f9e211548 100644
--- a/workspace_tools/host_tests/wfi_auto.py
+++ b/workspace_tools/host_tests/wfi_auto.py
@@ -25,9 +25,13 @@ class WFITest():
     def test(self, selftest):
         result = True
         c = selftest.mbed.serial_readline()
-        if c is None or c.strip() != "0":
+
+        if c is None
             return selftest.RESULT_IO_SERIAL
 
+        if c.strip() != "0":
+            return selftest.RESULT_IO_FAIL
+
         # Wait 10 seconds to allow serial prints (indicating failure)
         selftest.mbed.set_serial_timeout(10)