diff --git a/src/builder.cc b/src/builder.cc
index b7ffcec3..33fd17e8 100644
--- a/src/builder.cc
+++ b/src/builder.cc
@@ -88,8 +88,6 @@ Builder::Builder()
 Builder::~Builder()
 {
     for (auto [bb_id, disposer] : disposers_) {
-        auto bb_id(std::get<0>(kv));
-        auto disposer(std::get<1>(kv));
         disposer(bb_id.c_str());
     }
 }