diff --git a/libs/libc/include/luna/os-limits.h b/libs/libc/include/luna/os-limits.h
new file mode 100644
index 00000000..fbf222f0
--- /dev/null
+++ b/libs/libc/include/luna/os-limits.h
@@ -0,0 +1,10 @@
+#ifndef _LUNA_OS_LIMITS_H
+#define _LUNA_OS_LIMITS_H
+
+#define OPEN_MAX 32
+#define ATEXIT_MAX 32
+
+#define PAGESIZE 4096
+#define PAGE_SIZE 4096
+
+#endif
\ No newline at end of file
diff --git a/libs/libc/include/stdio.h b/libs/libc/include/stdio.h
index 768a60f5..77707434 100644
--- a/libs/libc/include/stdio.h
+++ b/libs/libc/include/stdio.h
@@ -6,6 +6,8 @@
 
 #include <bits/seek.h>
 
+#define FOPEN_MAX 32
+
 typedef struct
 {
     int f_fd;
diff --git a/libs/libc/include/unistd.h b/libs/libc/include/unistd.h
index 2e324007..80add4cb 100644
--- a/libs/libc/include/unistd.h
+++ b/libs/libc/include/unistd.h
@@ -3,6 +3,7 @@
 
 #include <bits/macros.h>
 #include <bits/seek.h>
+#include <luna/os-limits.h>
 #include <sys/types.h>
 
 #define STDOUT_FILENO 0