diff --git a/crates/but-core/src/unified_diff.rs b/crates/but-core/src/unified_diff.rs
index 9ca8826625..dd41da4b5f 100644
--- a/crates/but-core/src/unified_diff.rs
+++ b/crates/but-core/src/unified_diff.rs
@@ -187,7 +187,10 @@ impl UnifiedDiff {
                         Ok(())
                     }
                 }
-                let input = prep.interned_input();
+                let input = gix::diff::blob::intern::InternedInput::new(
+                    prep.old.intern_source(),
+                    prep.new.intern_source(),
+                );
                 let uni_diff = gix::diff::blob::UnifiedDiff::new(
                     &input,
                     ConsumeBinaryHunk::new(ProduceDiffHunk::default(), "\n"),