diff --git a/build/build-framework.fsx b/build/build-framework.fsx
index da5ff035..b57cc195 100644
--- a/build/build-framework.fsx
+++ b/build/build-framework.fsx
@@ -80,6 +80,9 @@ let traceHeader (releases:Release list) =
 let libnet35 = "lib/net35"
 let libnet40 = "lib/net40"
 let libnet45 = "lib/net45"
+let netstandard13 = "lib/netstandard1.3"
+let netstandard16 = "lib/netstandard1.6"
+let netstandard20 = "lib/netstandard2.0"
 let libpcl7 = "lib/portable-net45+netcore45+MonoAndroid1+MonoTouch1"
 let libpcl47 = "lib/portable-net45+sl5+netcore45+MonoAndroid1+MonoTouch1"
 let libpcl78 = "lib/portable-net45+netcore45+wp8+MonoAndroid1+MonoTouch1"