diff --git a/src/main.cc b/src/main.cc
index b240842e..e8963e44 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -33,6 +33,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 using namespace Kakoune;