diff --git a/src/basic/missing_sched.h b/src/basic/missing_sched.h
index bbfc30cc8fb..6e5e2b1e20b 100644
--- a/src/basic/missing_sched.h
+++ b/src/basic/missing_sched.h
@@ -13,6 +13,13 @@
 assert_cc(CLONE_NEWCGROUP == 0x02000000);
 #endif
 
+/* b3e5838252665ee4cfa76b82bdf1198dca81e5be (5.2) */
+#ifndef CLONE_PIDFD
+#  define CLONE_PIDFD 0x00001000
+#else
+assert_cc(CLONE_PIDFD == 0x00001000);
+#endif
+
 /* 769071ac9f20b6a447410c7eaa55d1a5233ef40c (5.8) */
 #ifndef CLONE_NEWTIME
 #  define CLONE_NEWTIME 0x00000080
diff --git a/src/basic/raw-clone.h b/src/basic/raw-clone.h
index 36202cc0ba4..91b0069fb5b 100644
--- a/src/basic/raw-clone.h
+++ b/src/basic/raw-clone.h
@@ -11,6 +11,7 @@
 
 #include "log.h"
 #include "macro.h"
+#include "missing_sched.h"
 #include "process-util.h"
 
 /**