diff --git a/pkgs/tools/misc/castty/default.nix b/pkgs/tools/misc/castty/default.nix
index ddda737c8b5b..075c6d739b3f 100644
--- a/pkgs/tools/misc/castty/default.nix
+++ b/pkgs/tools/misc/castty/default.nix
@@ -13,7 +13,10 @@ stdenv.mkDerivation {
 
   buildInputs = [ libsoundio lame ];
 
-  makeFlags = [ "PREFIX=$(out)" ];
+  makeFlags = [
+    "CC=${stdenv.cc.targetPrefix}cc"
+    "PREFIX=$(out)"
+  ];
 
   meta = with lib; {
     description = "CLI tool to record audio-enabled screencasts of your terminal, for the web";