1 files changed, 2 insertions, 0 deletions

diff --git a/src/usr.bin/nc/atomicio.c b/src/usr.bin/nc/atomicio.c
index 02289f0a2a..4437b6717b 100644
--- a/src/usr.bin/nc/atomicio.c
+++ b/src/usr.bin/nc/atomicio.c
@@ -29,6 +29,8 @@
 #include <errno.h>
 #include <unistd.h>
 
+ssize_t atomicio(ssize_t (*f)(int, void *, size_t), int fd, void *_s, size_t n);
+
 /*
  * ensure all of data on socket comes through. f==read || f==write
  */