diff --git a/dyaml/zerostring.d b/dyaml/zerostring.d
index ecaeb21..841a097 100644
--- a/dyaml/zerostring.d
+++ b/dyaml/zerostring.d
@@ -44,7 +44,7 @@ struct ZeroString(string TypeName)
         }
 
         ///Test for equality with another string.
-        bool opEquals(const ref ZeroString str) const nothrow @trusted
+        bool opEquals(const ZeroString str) const nothrow @trusted
         {
             return isNull ? str.isNull : 
                    str.isNull ? false : (0 == strcmp(str_, str.str_));