diff --git a/src/undead/xml.d b/src/undead/xml.d
index bf65d73..c4eed06 100644
--- a/src/undead/xml.d
+++ b/src/undead/xml.d
@@ -437,7 +437,7 @@ string decode(string s, DecodeMode mode=DecodeMode.LOOSE) @safe pure
     if (mode == DecodeMode.NONE) return s;
 
     string buffer;
-    foreach (ref i; 0 .. s.length)
+    for (size_t i = 0; i < s.length; i++)
     {
         char c = s[i];
         if (c != '&')