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-rw-r--r--signal/sigismem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/signal/sigismem.c b/signal/sigismem.c
index 728d58f7a3..c788ca83b1 100644
--- a/signal/sigismem.c
+++ b/signal/sigismem.c
@@ -17,6 +17,7 @@
 
 #include <errno.h>
 #include <signal.h>
+#include <stddef.h>
 #include <sigsetops.h>
 
 /* Return 1 if SIGNO is in SET, 0 if not.  */