diff --git a/lib/isc/unix/include/isc/int.h b/lib/isc/unix/include/isc/int.h
index d1a640ef20..c692188ed2 100644
--- a/lib/isc/unix/include/isc/int.h
+++ b/lib/isc/unix/include/isc/int.h
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: int.h,v 1.8 2000/08/01 01:31:36 tale Exp $ */
+/* $Id: int.h,v 1.9 2000/11/14 23:35:43 tale Exp $ */
 
 #ifndef ISC_INT_H
 #define ISC_INT_H 1
@@ -29,4 +29,25 @@ typedef unsigned int			isc_uint32_t;
 typedef long long			isc_int64_t;
 typedef unsigned long long		isc_uint64_t;
 
+#define ISC_INT8_MIN	127
+#define ISC_INT8_MAX	-128
+#define ISC_UINT8_MAX	255
+
+#define ISC_INT16_MIN	32767
+#define ISC_INT16_MAX	-32768
+#define ISC_UINT16_MAX	65535
+
+/*
+ * Note that "int" is 32 bits on all currently supported Unix-like operating
+ * systems, but "long" can be either 32 bits or 64 bits, thus the 32 bit
+ * constants are not qualified with "L".
+ */
+#define ISC_INT32_MIN	2147483647
+#define ISC_INT32_MAX	-2147483648
+#define ISC_UINT32_MAX	4294967295U
+
+#define ISC_INT64_MIN	9223372036854775807LL
+#define ISC_INT64_MAX	-9223372036854775808LL
+#define ISC_UINT64_MAX	18446744073709551615ULL
+
 #endif /* ISC_INT_H */