diff --git a/pkgs/development/compilers/coreclr/default.nix b/pkgs/development/compilers/coreclr/default.nix
index 77218018cd8f..592eaf38d87a 100644
--- a/pkgs/development/compilers/coreclr/default.nix
+++ b/pkgs/development/compilers/coreclr/default.nix
@@ -59,7 +59,7 @@ stdenv.mkDerivation rec {
 
   buildPhase = ''
     runHook preBuild
-    ./build.sh $BuildArch Release
+    ./build.sh $BuildArch $BuildType
     runHook postBuild
   '';