diff --git a/pkgs/by-name/st/stb/package.nix b/pkgs/by-name/st/stb/package.nix
index 881eff8b8bc1..70eb6e5cc450 100644
--- a/pkgs/by-name/st/stb/package.nix
+++ b/pkgs/by-name/st/stb/package.nix
@@ -38,6 +38,7 @@ stdenv.mkDerivation rec {
     runHook preInstall
     mkdir -p $out/include/stb
     cp *.h $out/include/stb/
+    cp *.c $out/include/stb/
     runHook postInstall
   '';