diff --git a/Kernel/API/POSIX/unistd.h b/Kernel/API/POSIX/unistd.h
index 523d7b83e2f..6a9a36dfd23 100644
--- a/Kernel/API/POSIX/unistd.h
+++ b/Kernel/API/POSIX/unistd.h
@@ -53,6 +53,7 @@ enum {
 #define _SC_NPROCESSORS_ONLN _SC_NPROCESSORS_ONLN
 #define _SC_OPEN_MAX _SC_OPEN_MAX
 #define _SC_PAGESIZE _SC_PAGESIZE
+#define _SC_PAGE_SIZE _SC_PAGESIZE
 #define _SC_HOST_NAME_MAX _SC_HOST_NAME_MAX
 #define _SC_TTY_NAME_MAX _SC_TTY_NAME_MAX
 #define _SC_GETPW_R_SIZE_MAX _SC_GETPW_R_SIZE_MAX