diff --git a/frontend/drivers/platform_darwin.m b/frontend/drivers/platform_darwin.m
index 071e3e4a51..23f057f2ab 100644
--- a/frontend/drivers/platform_darwin.m
+++ b/frontend/drivers/platform_darwin.m
@@ -19,6 +19,7 @@
 #include <boolean.h>
 #include <stddef.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <sys/utsname.h>