diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index 0b23f73167..47f1f7744a 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -59,6 +59,8 @@
 #define _SC_VERSION				24
 #define _SC_GETGR_R_SIZE_MAX	25
 #define _SC_GETPW_R_SIZE_MAX	26
+#define _SC_PAGE_SIZE			27
+#define _SC_PAGESIZE			_SC_PAGE_SIZE
 
 /* lseek() constants */
 #ifndef SEEK_SET
diff --git a/src/system/libroot/posix/unistd/conf.c b/src/system/libroot/posix/unistd/conf.c
index 1b391a7777..4f95e181a2 100644
--- a/src/system/libroot/posix/unistd/conf.c
+++ b/src/system/libroot/posix/unistd/conf.c
@@ -58,6 +58,8 @@ sysconf(int name)
 			return MAX_GROUP_BUFFER_SIZE;
 		case _SC_GETPW_R_SIZE_MAX:
 			return MAX_PASSWD_BUFFER_SIZE;
+		case _SC_PAGE_SIZE:
+			return B_PAGE_SIZE;
 	}
 
 	return -1;