diff --git a/tools/versioner/src/DeclarationDatabase.cpp b/tools/versioner/src/DeclarationDatabase.cpp
index b41c865..ec2e38d 100644
--- a/tools/versioner/src/DeclarationDatabase.cpp
+++ b/tools/versioner/src/DeclarationDatabase.cpp
@@ -190,8 +190,8 @@
     auto symbol_it = database.symbols.find(declaration_name);
     if (symbol_it == database.symbols.end()) {
       Symbol symbol = {.name = declaration_name };
-      bool dummy;
-      std::tie(symbol_it, dummy) = database.symbols.insert({ declaration_name, symbol });
+      bool unused;
+      std::tie(symbol_it, unused) = database.symbols.insert({declaration_name, symbol});
     }
 
     auto expansion_range = src_manager.getExpansionRange(range);