diff --git a/zathura.c b/zathura.c
index 7aa268b..696b570 100644
--- a/zathura.c
+++ b/zathura.c
@@ -4,6 +4,7 @@
 #define _XOPEN_SOURCE 700
 
 #include <stdlib.h>
+#include <unistd.h>
 
 #include <girara/datastructures.h>
 #include <girara/utils.h>