diff --git a/src/tests.rs b/src/tests.rs
index 0c538618..d2fecbed 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -295,6 +295,17 @@ fn bad_url_slice_not_at_char_boundary() {
     assert_eq!(result, Ok(&Token::BadUrl("9\n۰".into())));
 }
 
+/// https://bugzilla.mozilla.org/show_bug.cgi?id=2089012
+#[test]
+fn bad_url_escape_after_whitespace() {
+    let mut parser = Parser::new("url(foo \\) bar) baz");
+    let result = parser.next_including_whitespace_and_comments();
+    assert_eq!(result, Ok(&Token::BadUrl("foo \\) bar".into())));
+    let mut parser = Parser::new("url(foo \\\\) bar");
+    let result = parser.next_including_whitespace_and_comments();
+    assert_eq!(result, Ok(&Token::BadUrl("foo \\\\".into())));
+}
+
 #[test]
 fn unquoted_url_escaping() {
     let token = Token::UnquotedUrl(
diff --git a/src/tokenizer.rs b/src/tokenizer.rs
index 64a7798f..07342cf6 100644
--- a/src/tokenizer.rs
+++ b/src/tokenizer.rs
@@ -1341,10 +1341,8 @@ fn consume_unquoted_url<'a>(parser: &mut Parser<'a>) -> Result<Token<'a>, ()> {
                 b'\n' | b'\x0C' | b'\r' => {
                     parser.consume_newline();
                 }
-                b => {
-                    parser.consume_known_byte(b);
-                    return consume_bad_url(parser, start_pos);
-                }
+                // NOTE: No advance(), to deal correctly with escapes.
+                b => return consume_bad_url(parser, start_pos),
             }
         }
         UnquotedUrl(string)