diff --git a/src/google/protobuf/compiler/cpp/helpers.cc b/src/google/protobuf/compiler/cpp/helpers.cc
index f9b4c5806aab3..163e971fdc300 100644
--- a/src/google/protobuf/compiler/cpp/helpers.cc
+++ b/src/google/protobuf/compiler/cpp/helpers.cc
@@ -2062,7 +2062,7 @@ static bool HasBootstrapProblem(const FileDescriptor* file,
   };
   static auto& bootstrap_cache = *new BootstrapGlobals();
 
-  absl::MutexLock lock(&bootstrap_cache.mutex);
+  absl::MutexLock lock(bootstrap_cache.mutex);
   if (bootstrap_cache.cached.contains(file)) return true;
   if (bootstrap_cache.non_cached.contains(file)) return false;