diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 4106512ed0bf0..4bfd7089629e5 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -4402298,7 +4402298,7 @@ py
 :
 [
 "
-e8c6af20857d210aef792f7d78aaddd3fdd8adcf
+8f95bd492322a65a5bbb78430734b769730d9e35
 "
 "
 support
diff --git a/testing/web-platform/tests/tools/serve/serve.py b/testing/web-platform/tests/tools/serve/serve.py
index ea428a74ac771..8f1462647c279 100644
--- a/testing/web-platform/tests/tools/serve/serve.py
+++ b/testing/web-platform/tests/tools/serve/serve.py
@@ -73,12 +73,6 @@
 js_meta_re
 parse_variants
 from
-mozlog
-.
-structuredlog
-import
-StructuredLogger
-from
 wptserve
 import
 server
@@ -5032,6 +5026,44 @@
 =
 None
 def
+release_mozlog_lock
+(
+)
+:
+    
+try
+:
+        
+from
+mozlog
+import
+StructuredLogger
+        
+try
+:
+            
+StructuredLogger
+.
+_lock
+.
+release
+(
+)
+        
+except
+threading
+.
+ThreadError
+:
+            
+pass
+    
+except
+ImportError
+:
+        
+pass
+def
 start_ws_server
 (
 host
@@ -5075,25 +5107,10 @@
 logging
 )
     
-try
-:
-        
-StructuredLogger
-.
-_lock
-.
-release
+release_mozlog_lock
 (
 )
     
-except
-threading
-.
-ThreadError
-:
-        
-pass
-    
 return
 WebSocketDaemon
 (
@@ -5169,25 +5186,10 @@
 logging
 )
     
-try
-:
-        
-StructuredLogger
-.
-_lock
-.
-release
+release_mozlog_lock
 (
 )
     
-except
-threading
-.
-ThreadError
-:
-        
-pass
-    
 return
 WebSocketDaemon
 (