diff --git a/rcv-site.cabal b/rcv-site.cabal
index 87c4823..2c9ea01 100644
--- a/rcv-site.cabal
+++ b/rcv-site.cabal
@@ -84,4 +84,5 @@ executable server
     -fwarn-tabs
     -fwarn-incomplete-record-updates
     -fwarn-identities
-    "-with-rtsopts=-I0"
+    -threaded
+    "-with-rtsopts=-I0 -N"