diff --git a/src/token/mod.rs b/src/token/mod.rs
index b802d77..e33d34e 100644
--- a/src/token/mod.rs
+++ b/src/token/mod.rs
@@ -346,7 +346,7 @@ fn partial_tokens_to_tokens(mut tokens: &[PartialToken]) -> EvalexprResult<Vec<T
                     },
                 },
                 PartialToken::ExclamationMark => match second {
-                    Some(PartialToken::Eq) => Some(Token::Eq),
+                    Some(PartialToken::Eq) => Some(Token::Neq),
                     _ => {
                         cutoff = 1;
                         Some(Token::Not)