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-rw-r--r--sysdeps/mach/hurd/waitid.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/waitid.c b/sysdeps/mach/hurd/waitid.c
index dce72339dd..044a1dd8e3 100644
--- a/sysdeps/mach/hurd/waitid.c
+++ b/sysdeps/mach/hurd/waitid.c
@@ -19,6 +19,7 @@
 
 #include <errno.h>
 #include <sys/wait.h>
+#include <stddef.h>
 
 int
 __waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)