diff --git a/components/script/dom/servoparser/async_html.rs b/components/script/dom/servoparser/async_html.rs
index ed405c9ca61..551692af1f8 100644
--- a/components/script/dom/servoparser/async_html.rs
+++ b/components/script/dom/servoparser/async_html.rs
@@ -318,7 +318,7 @@ impl Tokenizer {
                     let script = self.get_node(&script.id);
                     return TokenizerResult::Script(DomRoot::from_ref(script.downcast().unwrap()));
                 },
-                ToTokenizerMsg::End => unreachable!(),
+                _ => unreachable!(),
             };
         }
     }
@@ -334,8 +334,12 @@ impl Tokenizer {
                 .expect("Unexpected channel panic in main thread.")
             {
                 ToTokenizerMsg::ProcessOperation(parse_op) => self.process_operation(parse_op),
+                ToTokenizerMsg::TokenizerResultDone { updated_input: _ } |
+                ToTokenizerMsg::TokenizerResultScript {
+                    script: _,
+                    updated_input: _,
+                } => continue,
                 ToTokenizerMsg::End => return,
-                _ => unreachable!(),
             };
         }
     }
diff --git a/tests/wpt/mozilla/meta/mozilla/parser-reentrancy-customelement.window.js.ini b/tests/wpt/mozilla/meta/mozilla/parser-reentrancy-customelement.window.js.ini
deleted file mode 100644
index 68996501463..00000000000
--- a/tests/wpt/mozilla/meta/mozilla/parser-reentrancy-customelement.window.js.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[parser-reentrancy-customelement.window.html?default]
-  prefs: ["dom.servoparser.async_html_tokenizer.enabled:false"]
-
-[parser-reentrancy-customelement.window.html?async]
-  expected: CRASH
-  prefs: ["dom.servoparser.async_html_tokenizer.enabled:true"]
\ No newline at end of file