diff --git a/codex-rs/core/src/tools/handlers/apply_patch.rs b/codex-rs/core/src/tools/handlers/apply_patch.rs
index d71eb7931a..ce869106c3 100644
--- a/codex-rs/core/src/tools/handlers/apply_patch.rs
+++ b/codex-rs/core/src/tools/handlers/apply_patch.rs
@@ -56,6 +56,7 @@ pub struct ApplyPatchHandler;
 #[derive(Default)]
 struct ApplyPatchArgumentDiffConsumer {
     parser: StreamingPatchParser,
+    last_progress: Option<Vec<Hunk>>,
     last_sent_at: Option<Instant>,
     pending: Option<PatchApplyUpdatedEvent>,
 }
@@ -87,7 +88,11 @@ impl ApplyPatchArgumentDiffConsumer {
         if hunks.is_empty() {
             return None;
         }
+        if self.last_progress.as_ref() == Some(&hunks) {
+            return None;
+        }
         let changes = convert_apply_patch_hunks_to_protocol(&hunks);
+        self.last_progress = Some(hunks);
         let event = PatchApplyUpdatedEvent { call_id, changes };
         let now = Instant::now();
         match self.last_sent_at {