diff --git a/crates/git_ui/src/git_panel.rs b/crates/git_ui/src/git_panel.rs
index 4a5cd56ec90fd95fe94d55edfdeb7e2114fea820..4e9dfce63442153bd27221bd5bb75834c1791193 100644
--- a/crates/git_ui/src/git_panel.rs
+++ b/crates/git_ui/src/git_panel.rs
@@ -1950,7 +1950,7 @@ impl GitPanel {
             .lines()
             .map(|line| {
                 if line.len() > 256 {
-                    format!("{}...[truncated]\n", &line[..256])
+                    format!("{}...[truncated]\n", &line[..line.floor_char_boundary(256)])
                 } else {
                     format!("{}\n", line)
                 }
@@ -5897,7 +5897,7 @@ mod tests {
 
     #[test]
     fn test_compress_diff_truncate_long_lines() {
-        let long_line = "a".repeat(300);
+        let long_line = "🦀".repeat(300);
         let diff = indoc::formatdoc! {"
             --- a/file.txt
             +++ b/file.txt