diff --git a/artiq-fast/conda-windows/llvm-or1k.nix b/artiq-fast/conda-windows/llvm-or1k.nix
index b82a50f..64ea5a5 100644
--- a/artiq-fast/conda-windows/llvm-or1k.nix
+++ b/artiq-fast/conda-windows/llvm-or1k.nix
@@ -35,7 +35,7 @@ let
 
       requirements:
         build:
-          vs2017
+          vs2017_win-64
 
       EOF