1 files changed, 1 insertions, 0 deletions

diff --git a/common.h b/common.h
index b8c38e0..8b87363 100644
--- a/common.h
+++ b/common.h
@@ -2,6 +2,7 @@
 #define DO_COMMON_H
 
 #include <stdlib.h>
+#include <unistd.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>