diff --git a/src/platforms/atomic-kms/include/gbm_format_conversions.h b/src/platforms/atomic-kms/include/gbm_format_conversions.h
deleted file mode 100644
index 42f78875ad2..00000000000
--- a/src/platforms/atomic-kms/include/gbm_format_conversions.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright © Canonical Ltd.
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License version 2 or 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-#ifndef MIR_GRAPHICS_GBM_GBM_FORMAT_CONVERSIONS_H_
-#define MIR_GRAPHICS_GBM_GBM_FORMAT_CONVERSIONS_H_
-
-#include <mir_toolkit/common.h>
-#include <stdint.h>
-#include <limits>
-
-namespace mir
-{
-namespace graphics
-{
-namespace atomic
-{
-enum : uint32_t { invalid_atomic_format = std::numeric_limits<uint32_t>::max() };
-
-}
-}
-}
-#endif /* MIR_GRAPHICS_GBM_GBM_FORMAT_CONVERSIONS_H_ */