diff --git a/meson.build b/meson.build
index 6ea9fce85ad..0d68f146fd4 100644
--- a/meson.build
+++ b/meson.build
@@ -624,11 +624,13 @@ foreach ident : [
         ['pidfd_send_signal', '''#include <stdlib.h>
                                  #include <unistd.h>
                                  #include <signal.h>
-                                 #include <sys/wait.h>'''],
+                                 #include <sys/wait.h>
+                                 #include <sys/pidfd.h>'''],
         ['pidfd_open',        '''#include <stdlib.h>
                                  #include <unistd.h>
                                  #include <signal.h>
-                                 #include <sys/wait.h>'''],
+                                 #include <sys/wait.h>
+                                 #include <sys/pidfd.h>'''],
         ['rt_sigqueueinfo',   '''#include <stdlib.h>
                                  #include <unistd.h>
                                  #include <signal.h>
diff --git a/src/basic/pidref.c b/src/basic/pidref.c
index 875fa11bea8..ae04dd72a4b 100644
--- a/src/basic/pidref.c
+++ b/src/basic/pidref.c
@@ -1,5 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
+
 #include "errno-util.h"
 #include "fd-util.h"
 #include "missing_syscall.h"
diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index bd5bd81ac43..a1305ef0149 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -1,6 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <sys/epoll.h>
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
 #include <sys/timerfd.h>
 #include <sys/wait.h>
 
diff --git a/src/libsystemd/sd-event/test-event.c b/src/libsystemd/sd-event/test-event.c
index c6179359922..57dee392d74 100644
--- a/src/libsystemd/sd-event/test-event.c
+++ b/src/libsystemd/sd-event/test-event.c
@@ -1,5 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
 #include <sys/wait.h>
 #include <unistd.h>
 
diff --git a/src/libsystemd/sd-login/test-login.c b/src/libsystemd/sd-login/test-login.c
index c83c953dd92..66e427411e4 100644
--- a/src/libsystemd/sd-login/test-login.c
+++ b/src/libsystemd/sd-login/test-login.c
@@ -1,6 +1,9 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <poll.h>
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
 
 #include "sd-login.h"
 
diff --git a/src/login/pam_systemd.c b/src/login/pam_systemd.c
index e01f35b65e4..a711c89b12b 100644
--- a/src/login/pam_systemd.c
+++ b/src/login/pam_systemd.c
@@ -10,6 +10,9 @@
 #include <security/pam_modules.h>
 #include <security/pam_modutil.h>
 #include <sys/file.h>
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
 #include <sys/stat.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
diff --git a/src/test/test-aux-scope.c b/src/test/test-aux-scope.c
index c6a1d292730..0170314035c 100644
--- a/src/test/test-aux-scope.c
+++ b/src/test/test-aux-scope.c
@@ -3,6 +3,9 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#if HAVE_PIDFD_OPEN
+#include <sys/pidfd.h>
+#endif
 #include <sys/wait.h>
 
 #include "sd-event.h"