diff --git a/sys/include/limits.h b/sys/include/limits.h
new file mode 100644
index 0000000..ee84533
--- /dev/null
+++ b/sys/include/limits.h
@@ -0,0 +1,21 @@
+#ifndef LIMITS_H
+#define LIMITS_H
+
+#define	CHAR_BIT	8
+#define UCHAR_MAX	255
+#define SCHAR_MAX	127
+#define SCHAR_MIN	(-128)
+
+/* x86 */
+#define CHAR_MAX	SCHAR_MAX
+#define CHAR_MIN	SCHAR_MIN
+
+#define INT_MAX		214748367
+#define INT_MIN		(-INT_MAX - 1)
+#define UINT_MAX	(2U * UINT_MAX + 1)
+
+#define SHRT_MAX	32667
+#define SHRT_MIN	(-SHRT_MAX - 1)
+#define USHRT_MAX	65535
+
+#endif