diff --git a/packs/pack.md b/packs/pack.md
index d32b204..9984b8c 100644
--- a/packs/pack.md
+++ b/packs/pack.md
@@ -412,7 +412,7 @@ int main() {
   @meta types.erase(std::unique(types.begin(), types.end()), types.end());
 
   // Instantiate foo_t on the unique types.
-  foo_t<@pack_type(types.data(), types.size())...> foo;
+  foo_t<@pack_type(types)...> foo;
 
   return 0;
 }
diff --git a/packs/pack_type.cxx b/packs/pack_type.cxx
index 99a15c9..aca45d2 100644
--- a/packs/pack_type.cxx
+++ b/packs/pack_type.cxx
@@ -30,7 +30,7 @@ int main() {
   @meta types.erase(std::unique(types.begin(), types.end()), types.end());
 
   // Instantiate foo_t on the unique types.
-  foo_t<@pack_type(types.data(), types.size())...> foo;
+  foo_t<@pack_type(types)...> foo;
 
   return 0;
 }
\ No newline at end of file