diff --git a/src/label.rs b/src/label.rs
index 4ba4d351..d0879bfc 100644
--- a/src/label.rs
+++ b/src/label.rs
@@ -57,7 +57,7 @@ where
         inp.errors.alt = old_alt;
 
         if let Some(mut new_alt) = new_alt {
-            let before_next = before.offset.into();
+            let before_next = before.offset.into() + 1;
             if new_alt.pos.into() == before_next {
                 new_alt.err.label_with(self.label.clone());
             } else if self.is_context && new_alt.pos.into() > before_next {