diff --git a/weed/filer/filer_deletion.go b/weed/filer/filer_deletion.go
index 2ecc4a335..ea03015ed 100644
--- a/weed/filer/filer_deletion.go
+++ b/weed/filer/filer_deletion.go
@@ -310,7 +310,21 @@ func (f *Filer) loopProcessingDeletion() {
 // It classifies errors into retryable and permanent categories, adds retryable failures
 // to the retry queue, and logs appropriate messages.
 func (f *Filer) processDeletionBatch(toDeleteFileIds []string, lookupFunc func([]string) (map[string]*operation.LookupResult, error)) {
-	results := operation.DeleteFileIdsWithLookupVolumeId(f.GrpcDialOption, toDeleteFileIds, lookupFunc)
+	// Deduplicate file IDs to prevent incorrect retry count increments for the same file ID within a single batch.
+	uniqueFileIds := make([]string, 0, len(toDeleteFileIds))
+	processed := make(map[string]struct{}, len(toDeleteFileIds))
+	for _, fileId := range toDeleteFileIds {
+		if _, found := processed[fileId]; !found {
+			processed[fileId] = struct{}{}
+			uniqueFileIds = append(uniqueFileIds, fileId)
+		}
+	}
+
+	if len(uniqueFileIds) == 0 {
+		return
+	}
+
+	results := operation.DeleteFileIdsWithLookupVolumeId(f.GrpcDialOption, uniqueFileIds, lookupFunc)
 
 	// Process individual results for better error tracking
 	var successCount, notFoundCount, retryableErrorCount, permanentErrorCount int
@@ -345,7 +359,7 @@ func (f *Filer) processDeletionBatch(toDeleteFileIds []string, lookupFunc func([
 	totalErrors := retryableErrorCount + permanentErrorCount
 	if totalErrors > 0 {
 		logMessage := fmt.Sprintf("failed to delete %d/%d files (%d retryable, %d permanent)",
-			totalErrors, len(toDeleteFileIds), retryableErrorCount, permanentErrorCount)
+			totalErrors, len(uniqueFileIds), retryableErrorCount, permanentErrorCount)
 		if totalErrors > MaxLoggedErrorDetails {
 			logMessage += fmt.Sprintf(" (showing first %d)", MaxLoggedErrorDetails)
 		}
diff --git a/weed/filer/filer_deletion_test.go b/weed/filer/filer_deletion_test.go
index 3c91ebf16..8aa7f87ca 100644
--- a/weed/filer/filer_deletion_test.go
+++ b/weed/filer/filer_deletion_test.go
@@ -262,3 +262,36 @@ func TestDeletionRetryQueue_HeapOrdering(t *testing.T) {
 		}
 	}
 }
+
+func TestDeletionRetryQueue_DuplicateFileIds(t *testing.T) {
+	queue := NewDeletionRetryQueue()
+
+	// Add same file ID twice with retryable error - simulates duplicate in batch
+	queue.AddOrUpdate("file1", "timeout error")
+	
+	// Verify only one item exists in queue
+	if queue.Size() != 1 {
+		t.Fatalf("Expected queue size 1 after first add, got %d", queue.Size())
+	}
+
+	// Add same file ID again - should increment retry count (simulates duplicate)
+	queue.AddOrUpdate("file1", "timeout error again")
+	
+	// Verify still only one item exists in queue (not duplicated)
+	if queue.Size() != 1 {
+		t.Errorf("Expected queue size 1 after duplicate add, got %d (duplicates detected)", queue.Size())
+	}
+	
+	// Verify retry count incremented to 2 by checking internal state
+	// Note: This documents the current behavior - AddOrUpdate increments retry count on duplicate
+	queue.lock.Lock()
+	item, exists := queue.itemIndex["file1"]
+	queue.lock.Unlock()
+	
+	if !exists {
+		t.Fatal("Item not found in queue")
+	}
+	if item.RetryCount != 2 {
+		t.Errorf("Expected RetryCount 2 after duplicate add (each AddOrUpdate increments), got %d", item.RetryCount)
+	}
+}