diff --git a/lib/isc/include/isc/magic.h b/lib/isc/include/isc/magic.h
index e323b0075b..ea1c5f8ed6 100644
--- a/lib/isc/include/isc/magic.h
+++ b/lib/isc/include/isc/magic.h
@@ -20,4 +20,8 @@
 
 #define ISC_MAGIC_VALID(a,b)	(((a) != NULL) && ((a)->magic == (b)))
 
+#define ISC_MAGIC(a, b, c, d)	((unsigned int)(a) << 24 \
+				 | (unsigned int)(b) << 16 \
+				 | (unsigned int)(c) << 8 | (d))
+
 #endif /* ISC_MAGIC_H */