diff --git a/src/lib.rs b/src/lib.rs
index 6d58a490..8abbb20d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -53,7 +53,7 @@ pub trait Logos<'source>: Sized {
 
     /// Error type returned by the lexer. This can be set using
     /// `#[logos(error = MyError)]`. Defaults to `()` if not set.
-    type Error: Default + Clone + PartialEq + Debug + 'source;
+    type Error: Default + 'source;
 
     /// The heart of Logos. Called by the `Lexer`. The implementation for this function
     /// is generated by the `logos-derive` crate.
diff --git a/tests/src/lib.rs b/tests/src/lib.rs
index 76d35308..f44f830d 100644
--- a/tests/src/lib.rs
+++ b/tests/src/lib.rs
@@ -94,6 +94,7 @@ pub fn assert_lex<'a, Token>(
 ) where
     Token: Logos<'a> + fmt::Debug + PartialEq,
     Token::Extras: Default,
+    Token::Error: fmt::Debug + PartialEq,
 {
     let mut lex = Token::lexer(source);