diff --git a/Libraries/LibProtocol/Makefile b/Libraries/LibProtocol/Makefile
index b734a6e440..fb5732a68d 100644
--- a/Libraries/LibProtocol/Makefile
+++ b/Libraries/LibProtocol/Makefile
@@ -4,4 +4,8 @@ OBJS = \
 
 LIBRARY = libprotocol.a
 
+Download.cpp: ../../Servers/ProtocolServer/ProtocolClientEndpoint.h
+../../Servers/ProtocolServer/ProtocolClientEndpoint.h:
+	@$(MAKE) -C $(dir $(@))
+
 include ../../Makefile.common