diff --git a/simgear/screen/video-encoder-internal.hxx b/simgear/screen/video-encoder-internal.hxx
index 5fdaee4e..e2772874 100644
--- a/simgear/screen/video-encoder-internal.hxx
+++ b/simgear/screen/video-encoder-internal.hxx
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+
 #pragma once
 
 #ifndef SG_VIDEO_ENCODER_STANDALONE
diff --git a/simgear/screen/video-encoder.cxx b/simgear/screen/video-encoder.cxx
index 722eada4..a3df870b 100644
--- a/simgear/screen/video-encoder.cxx
+++ b/simgear/screen/video-encoder.cxx
@@ -1,5 +1,6 @@
-#include "simgear_config.h"
+/* SPDX-License-Identifier: GPL-3.0-only */
 
+#include "simgear_config.h"
 #include "video-encoder.hxx"
 
 #ifdef SG_FFMPEG
diff --git a/simgear/screen/video-encoder.hxx b/simgear/screen/video-encoder.hxx
index 0368f6a2..f9e3401c 100644
--- a/simgear/screen/video-encoder.hxx
+++ b/simgear/screen/video-encoder.hxx
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+
 #pragma once
 
 #include <memory>