diff --git a/src/ipc_manager.h b/src/ipc_manager.h
index 7a719886..3b428679 100644
--- a/src/ipc_manager.h
+++ b/src/ipc_manager.h
@@ -5,7 +5,7 @@
 
 #include <memory>
 
-class lsBaseOutMessage;
+struct lsBaseOutMessage;
 
 struct IpcManager {
   struct StdoutMessage {