diff --git a/server/Makefile b/server/Makefile
index 9d736b2..bec5af5 100644
--- a/server/Makefile
+++ b/server/Makefile
@@ -40,7 +40,7 @@ $(APP).p.native: $(wildcard *.ml) lwt_installed
 	$(OCAMLBUILD) $@
 
 lwt_installed:
-	opam install camlp4 lwt
+	opam install camlp4 lwt lwt_camlp4
 
 run: all
 	./$(APP).native
diff --git a/server/_tags b/server/_tags
index 129d262..fc3d5c8 100644
--- a/server/_tags
+++ b/server/_tags
@@ -1,4 +1,4 @@
 true: package(lwt.unix)
-true: package(lwt.syntax)
+true: package(lwt_camlp4)
 true: syntax(camlp4o)
 true: use_str