diff --git a/SWIG/Source/DOH/doh.h b/SWIG/Source/DOH/doh.h
index e50b9fb18..af33933be 100644
--- a/SWIG/Source/DOH/doh.h
+++ b/SWIG/Source/DOH/doh.h
@@ -341,7 +341,7 @@ extern void DohSortList(DOH *lo, int (*cmp)(const DOH *, const DOH *));
  * ----------------------------------------------------------------------------- */
 
 extern DOHHash   *DohNewHash();
-extern DOH       *DohHashGetAttr(DOH *hash, DOH *key);
+extern DOH       *DohHashGetAttr(DOH *hash, const DOH *key);
 extern int       DohHashCheckAttr(DOH *hash, DOH *key, DOH *value);
 
 /* -----------------------------------------------------------------------------
diff --git a/SWIG/Source/DOH/hash.c b/SWIG/Source/DOH/hash.c
index 301040e97..03df97646 100644
--- a/SWIG/Source/DOH/hash.c
+++ b/SWIG/Source/DOH/hash.c
@@ -277,10 +277,10 @@ Hash_getattr(DOH *h, DOH *k) {
 }
 
 DOH *
-DohHashGetAttr(DOH *h, DOH *k) {
+DohHashGetAttr(DOH *h, const DOH *k) {
   DOH *obj = 0;
   Hash *ho = (Hash *) ObjData(h);
-  _Hash_getattr(ho, k, obj);
+  _Hash_getattr(ho, (DOH *) k, obj);
   return obj;
 }