--- a/testing/mozharness/mozharness/mozilla/testing/errors.py
+++ b/testing/mozharness/mozharness/mozilla/testing/errors.py
@@ -111,10 +111,10 @@ HarnessErrorList = [
     {'substr': 'PROCESS-CRASH', 'level': ERROR, },
 ]
 
 LogcatErrorList = [
     {'substr': 'Fatal signal 11 (SIGSEGV)', 'level': ERROR, 'explanation': 'This usually indicates the B2G process has crashed'},
     {'substr': 'Fatal signal 7 (SIGBUS)', 'level': ERROR, 'explanation': 'This usually indicates the B2G process has crashed'},
     {'substr': '[JavaScript Error:', 'level': WARNING},
     {'substr': 'seccomp sandbox violation', 'level': ERROR, 'explanation': 'A content process has violated the system call sandbox (bug 790923)'},
-    {'regex': re.compile(r"|thread (\w+) panicked", 'level': ERROR, 'explanation': "HELLO"},
+    {'regex': re.compile(r"|thread (\w+) panicked"), 'level': ERROR, 'explanation': "HELLO"},
 ]