diff --git a/lib/des/dh.h b/lib/des/dh.h
index 07075a999..533d832a3 100644
--- a/lib/des/dh.h
+++ b/lib/des/dh.h
@@ -40,6 +40,7 @@
 
 /* symbol renaming */
 #define DH_null_method hc_DH_null_method
+#define DH_imath_method hc_DH_imath_method
 #define DH_new hc_DH_new
 #define DH_new_method hc_DH_new_method
 #define DH_free hc_DH_free
@@ -113,6 +114,7 @@ struct DH {
  */
 
 const DH_METHOD *DH_null_method(void);
+const DH_METHOD *DH_imath_method(void);
 
 DH *	DH_new(void);
 DH *	DH_new_method(ENGINE *);