diff --git a/src/xenia/kernel/xfile.cc b/src/xenia/kernel/xfile.cc
index a419b466c..e5a4ff24b 100644
--- a/src/xenia/kernel/xfile.cc
+++ b/src/xenia/kernel/xfile.cc
@@ -24,7 +24,7 @@ XFile::XFile(KernelState* kernel_state, vfs::File* file, bool synchronous)
   assert_not_null(async_event_);
 }
 
-XFile::XFile() : XObject(kObjectType) {
+XFile::XFile() : XObject(kObjectType), completion_port_lock_() {
   async_event_ = threading::Event::CreateAutoResetEvent(false);
   assert_not_null(async_event_);
 }