diff --git a/preview/JFJochJPEG.h b/preview/JFJochJPEG.h
index 7614bb01..eaee11d1 100644
--- a/preview/JFJochJPEG.h
+++ b/preview/JFJochJPEG.h
@@ -1,8 +1,7 @@
 // SPDX-FileCopyrightText: 2024 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
 // SPDX-License-Identifier: GPL-3.0-only
 
-#ifndef JUNGFRAUJOCH_WRITEJPEG_H
-#define JUNGFRAUJOCH_WRITEJPEG_H
+#pragma once
 
 #include <vector>
 #include <string>
@@ -10,5 +9,3 @@
 #include "../common/CompressedImage.h"
 
 std::string WriteJPEGToMem(const CompressedImage &image, int quality = 70);
-
-#endif //JUNGFRAUJOCH_WRITEJPEG_H