diff --git a/hash.c b/hash.c.new
index ac0ebd7..e32aed3 100644
--- a/hash.c
+++ b/hash.c.new
@@ -122,10 +122,20 @@ rb_any_hash(VALUE a)
     }
     else if (BUILTIN_TYPE(a) == T_STRING) {
 	hnum = rb_str_hash(a);
-    }
-    else {
-        hval = rb_hash(a);
-	hnum = FIX2LONG(hval);
+    } else {
+#if SIZEOF_LONG_LONG == SIZEOF_VOIDP    
+        if (BUILTIN_TYPE(a) == T_BIGNUM) {
+            int sign;
+            unsigned long ul;
+            sign = rb_integer_pack(a, &ul, 1, sizeof(ul), 0,
+                    INTEGER_PACK_NATIVE_BYTE_ORDER);
+            ul &= (1UL << (sizeof(long)*CHAR_BIT-1)) - 1;
+            hnum = (sign < 0) ? LONG2FIX(-(long)ul) : LONG2FIX((long)ul);
+        } else {
+#endif	
+            hval = rb_hash(a);
+	    hnum = FIX2LONG(hval);
+	}
     }
     hnum <<= 1;
     return (st_index_t)RSHIFT(hnum, 1);