diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index afa0dccfe0f..023a05230c0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -241,7 +241,7 @@ let
 
   dotnetenv = import ../build-support/dotnetenv {
     inherit stdenv;
-    dotnetfx = dotnetfx35;
+    dotnetfx = dotnetfx40;
   };
 
   vsenv = callPackage ../build-support/vsenv {
@@ -592,6 +592,8 @@ let
 
   dotnetfx35 = callPackage ../development/libraries/dotnetfx35 { };
 
+  dotnetfx40 = callPackage ../development/libraries/dotnetfx40 { };
+
   dropbear = callPackage ../tools/networking/dropbear {
     enableStatic = true;
     zlib = zlibStatic;