diff --git a/Userland/Libraries/LibWebSocket/Message.h b/Userland/Libraries/LibWebSocket/Message.h
index 26659b3eb7..7192d466ee 100644
--- a/Userland/Libraries/LibWebSocket/Message.h
+++ b/Userland/Libraries/LibWebSocket/Message.h
@@ -8,6 +8,7 @@
 
 #include <AK/ByteBuffer.h>
 #include <AK/Optional.h>
+#include <AK/String.h>
 
 namespace WebSocket {