diff --git a/pkgs/tools/compression/brotli/default.nix b/pkgs/tools/compression/brotli/default.nix
index db5d1f21605..754c0e58156 100644
--- a/pkgs/tools/compression/brotli/default.nix
+++ b/pkgs/tools/compression/brotli/default.nix
@@ -15,6 +15,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
+  cmakeFlags = stdenv.lib.optional
+    (stdenv.hostPlatform.libc == "msvcrt") "-DCMAKE_SYSTEM_NAME=Windows";
+
   outputs = [ "out" "dev" "lib" ];
 
   doCheck = true;