diff --git a/crates/typst-library/src/layout/par.rs b/crates/typst-library/src/layout/par.rs
index bb280069c..9b5f641b6 100644
--- a/crates/typst-library/src/layout/par.rs
+++ b/crates/typst-library/src/layout/par.rs
@@ -1206,15 +1206,20 @@ impl Iterator for Breakpoints<'_> {
 
             // Fix for: https://github.com/unicode-org/icu4x/issues/4146
             if let Some(c) = self.p.bidi.text[..self.end].chars().next_back() {
+                if self.end == self.p.bidi.text.len() {
+                    self.mandatory = true;
+                    break;
+                }
+
                 self.mandatory = match lb.get(c) {
                     LineBreak::Glue | LineBreak::WordJoiner | LineBreak::ZWJ => continue,
                     LineBreak::MandatoryBreak
                     | LineBreak::CarriageReturn
                     | LineBreak::LineFeed
                     | LineBreak::NextLine => true,
-                    _ => self.end == self.p.bidi.text.len(),
+                    _ => false,
                 };
-            };
+            }
 
             break;
         }