diff --git a/src/basic/meson.build b/src/basic/meson.build
index f74bfb09d5..3730930c7f 100644
--- a/src/basic/meson.build
+++ b/src/basic/meson.build
@@ -105,6 +105,7 @@ basic_sources = files('''
         missing_input.h
         missing_keyctl.h
         missing_magic.h
+        missing_mman.h
         missing_network.h
         missing_prctl.h
         missing_resource.h
diff --git a/src/basic/missing.h b/src/basic/missing.h
index 79faeeb9cf..cd873a43ad 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -9,14 +9,6 @@
 #include <stdlib.h>
 #include <sys/syscall.h>
 
-#ifndef MFD_ALLOW_SEALING
-#define MFD_ALLOW_SEALING 0x0002U
-#endif
-
-#ifndef MFD_CLOEXEC
-#define MFD_CLOEXEC 0x0001U
-#endif
-
 #ifndef TIOCVHANGUP
 #define TIOCVHANGUP 0x5437
 #endif
@@ -142,6 +134,7 @@
 #include "missing_fcntl.h"
 #include "missing_input.h"
 #include "missing_magic.h"
+#include "missing_mman.h"
 #include "missing_network.h"
 #include "missing_prctl.h"
 #include "missing_resource.h"
diff --git a/src/basic/missing_mman.h b/src/basic/missing_mman.h
new file mode 100644
index 0000000000..7ff12f770b
--- /dev/null
+++ b/src/basic/missing_mman.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <sys/mman.h>
+
+#ifndef MFD_ALLOW_SEALING
+#define MFD_ALLOW_SEALING 0x0002U
+#endif
+
+#ifndef MFD_CLOEXEC
+#define MFD_CLOEXEC 0x0001U
+#endif