diff --git a/src/basic/forward.h b/src/basic/forward.h
index 0456772980..df3bdee233 100644
--- a/src/basic/forward.h
+++ b/src/basic/forward.h
@@ -57,7 +57,6 @@ struct ucred;
  * used for C++ symbol name mangling, they're effectively part of the ABI and won't actually change. */
 typedef struct _IO_FILE FILE;
 typedef struct __dirstream DIR;
-typedef __socklen_t socklen_t;
 
 /* 3rd-party library forward declarations */
 
diff --git a/src/journal/journald-audit.h b/src/journal/journald-audit.h
index eb4fe3e613..17ba2efbbb 100644
--- a/src/journal/journald-audit.h
+++ b/src/journal/journald-audit.h
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <sys/socket.h>
+
 #include "journald-forward.h"
 
 void manager_process_audit_message(Manager *m, const void *buffer, size_t buffer_size, const struct ucred *ucred, const union sockaddr_union *sa, socklen_t salen);
diff --git a/src/shared/selinux-util.h b/src/shared/selinux-util.h
index 9c5707f9fa..a9180c4c99 100644
--- a/src/shared/selinux-util.h
+++ b/src/shared/selinux-util.h
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
+#include <sys/socket.h>
+
 #include "forward.h"
 
 #if HAVE_SELINUX