diff --git a/include/mp/type-map.h b/include/mp/type-map.h
index 50a590c..5644b00 100644
--- a/include/mp/type-map.h
+++ b/include/mp/type-map.h
@@ -17,7 +17,7 @@ void CustomBuildField(TypeList<std::map<KeyLocalType, ValueLocalType>>,
     Value&& value,
     Output&& output)
 {
-    // FIXME dededup with vector handler above
+    // FIXME dedup with vector handler above
     auto list = output.init(value.size());
     size_t i = 0;
     for (const auto& elem : value) {
diff --git a/include/mp/type-set.h b/include/mp/type-set.h
index 699c6e9..2e780c3 100644
--- a/include/mp/type-set.h
+++ b/include/mp/type-set.h
@@ -16,7 +16,7 @@ void CustomBuildField(TypeList<std::set<LocalType>>,
     Value&& value,
     Output&& output)
 {
-    // FIXME dededup with vector handler above
+    // FIXME dedup with vector handler above
     auto list = output.init(value.size());
     size_t i = 0;
     for (const auto& elem : value) {