diff --git a/src/coredump/coredump-backtrace.c b/src/coredump/coredump-backtrace.c
index f18b5ff800..4ee38341c3 100644
--- a/src/coredump/coredump-backtrace.c
+++ b/src/coredump/coredump-backtrace.c
@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <unistd.h>
+
 #include "sd-journal.h"
 #include "sd-messages.h"
 
diff --git a/src/coredump/coredump-kernel-helper.c b/src/coredump/coredump-kernel-helper.c
index b97a96706b..105b943faa 100644
--- a/src/coredump/coredump-kernel-helper.c
+++ b/src/coredump/coredump-kernel-helper.c
@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include <unistd.h>
+
 #include "coredump-config.h"
 #include "coredump-context.h"
 #include "coredump-kernel-helper.h"
diff --git a/src/test/test-reread-partition-table.c b/src/test/test-reread-partition-table.c
index 07a0a02e15..5f465e61db 100644
--- a/src/test/test-reread-partition-table.c
+++ b/src/test/test-reread-partition-table.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <linux/loop.h>
+#include <sys/file.h>
 
 #include "blockdev-util.h"
 #include "fd-util.h"