diff --git a/src/sirit.cpp b/src/sirit.cpp
index 10f5910..3d71403 100644
--- a/src/sirit.cpp
+++ b/src/sirit.cpp
@@ -133,7 +133,6 @@ Id Module::AddDeclaration(std::unique_ptr<Op> op) {
 }
 
 void Module::AddAnnotation(std::unique_ptr<Op> op) {
-    const auto id = op.get();
     annotations.push_back(std::move(op));
 }