--- ./lib/core/src/perl/RefHash.xs.orig	2014-10-13 06:14:22.000000000 -0600
+++ ./lib/core/src/perl/RefHash.xs	2014-11-08 20:00:00.000000000 -0700
@@ -88,7 +88,7 @@ SV* ref2key(SV *keysv, tmp_keysv *tmp_ke
    }                                                                    \
 } STMT_END
 
-static char err_ref[]="Reference as a key in a normal hash";
+static const char err_ref[]="Reference as a key in a normal hash";
 
 static inline
 int ref_key_allowed(HV *class)