diff --git a/internal/blobgen/compress.go b/internal/blobgen/compress.go
index 1292fae..e8a8799 100644
--- a/internal/blobgen/compress.go
+++ b/internal/blobgen/compress.go
@@ -51,7 +51,13 @@ func CompressStream(dst io.Writer, src io.Reader, compressionLevel int, recipien
 	if err != nil {
 		return 0, "", fmt.Errorf("creating writer: %w", err)
 	}
-	defer func() { _ = w.Close() }()
+
+	closed := false
+	defer func() {
+		if !closed {
+			_ = w.Close()
+		}
+	}()
 
 	// Copy data
 	if _, err := io.Copy(w, src); err != nil {
@@ -62,6 +68,7 @@ func CompressStream(dst io.Writer, src io.Reader, compressionLevel int, recipien
 	if err := w.Close(); err != nil {
 		return 0, "", fmt.Errorf("closing writer: %w", err)
 	}
+	closed = true
 
 	return w.BytesWritten(), hex.EncodeToString(w.Sum256()), nil
 }