diff --git a/oi/exporters/ParsedData.cpp b/oi/exporters/ParsedData.cpp
index b8e779b..a6a323e 100644
--- a/oi/exporters/ParsedData.cpp
+++ b/oi/exporters/ParsedData.cpp
@@ -51,7 +51,7 @@ ParsedData ParsedData::parse(std::vector<uint8_t>::const_iterator& it,
           auto index = parseVarint(it);
           assert(index < ty.variants.size());
           return ParsedData::Sum{
-              .index = parseVarint(it),
+              .index = index,
               .value = {it, ty.variants[index]},
           };
         } else {