1 files changed, 1 insertions, 0 deletions

diff --git a/viewer.c b/viewer.c
index 0bc81f5..2ace20b 100644
--- a/viewer.c
+++ b/viewer.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <unistd.h>
 #include <string.h>
 #include <errno.h>