diff --git a/src/components/style/errors.rs b/src/components/style/errors.rs
index 1abd833fc39..b8d811aebd1 100644
--- a/src/components/style/errors.rs
+++ b/src/components/style/errors.rs
@@ -21,11 +21,6 @@ impl<T, I: Iterator<Result<T, SyntaxError>>> Iterator<T> for ErrorLoggerIterator
 }
 
 
-// FIXME: go back to `()` instead of `bool` after upgrading Rust
-// past 898669c4e203ae91e2048fb6c0f8591c867bccc6
-// Using bool is a work-around for https://github.com/mozilla/rust/issues/13322
-local_data_key!(silence_errors: bool)
-
 /// Defaults to a no-op.
 /// Set a `RUST_LOG=style::errors` environment variable
 /// to log CSS parse errors to stderr.
@@ -37,8 +32,10 @@ pub fn log_css_error(location: SourceLocation, message: &str) {
 }
 
 
+local_data_key!(silence_errors: ())
+
 pub fn with_errors_silenced<T>(f: || -> T) -> T {
-    silence_errors.replace(Some(true));
+    silence_errors.replace(Some(()));
     let result = f();
     silence_errors.replace(None);
     result