diff --git a/common/convert.cpp b/common/convert.cpp
index 6a12645..5759b72 100644
--- a/common/convert.cpp
+++ b/common/convert.cpp
@@ -668,7 +668,7 @@ namespace acommon {
           ++in;
         } else {
           NormLookupRet<E,const char> ret = norm_lookup<E>(data, in, stop, 0, in);
-          for (unsigned i = 0; ret.to[i] && i < E::max_to; ++i)
+          for (unsigned i = 0; i < E::max_to && ret.to[i]; ++i)
             out.append(ret.to[i]);
           in = ret.last + 1;
         }