diff --git a/artiq-fast/pkgs/binutils.nix b/artiq-fast/pkgs/binutils.nix
index cc06df4..50e326a 100644
--- a/artiq-fast/pkgs/binutils.nix
+++ b/artiq-fast/pkgs/binutils.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   basename = "binutils";
   inherit platform;
   version = "2.30";
-  name = "${basename}_${platform}-${version}";
+  name = "${basename}-${platform}-${version}";
   src = fetchurl {
     url = "https://ftp.gnu.org/gnu/binutils/binutils-${version}.tar.bz2";
     sha256 = "028cklfqaab24glva1ks2aqa1zxa6w6xmc8q34zs1sb7h22dxspg";