diff --git a/src/selector.rs b/src/selector.rs
index a94756d..4c8eaa7 100644
--- a/src/selector.rs
+++ b/src/selector.rs
@@ -334,6 +334,7 @@ impl<'a> SelectorParser<'a> {
                 c if c.is_control() => {
                     return Err("expected selector.".into());
                 }
+                '`' => return Err("expected selector.".into()),
                 _ => todo!("unimplemented selector"),
             };
         }
diff --git a/tests/error.rs b/tests/error.rs
index 0d89f8a..3c052c5 100644
--- a/tests/error.rs
+++ b/tests/error.rs
@@ -52,3 +52,4 @@ error!(
     control_character_starts_selector_inner,
     "a{l {color: foo;}}", "Error: expected selector."
 );
+error!(backtick_in_selector, "a`{}", "Error: expected selector.");