diff --git a/pkgs/tools/system/tm/default.nix b/pkgs/tools/system/tm/default.nix
index a5e413690d0..0a4c1e58fc5 100644
--- a/pkgs/tools/system/tm/default.nix
+++ b/pkgs/tools/system/tm/default.nix
@@ -8,6 +8,10 @@ stdenv.mkDerivation {
 
   patchPhase = ''sed -i 's@/usr/bin/install@install@g' Makefile'';
 
+  crossAttrs = {
+    makeFlags = "CC=${stdenv.cross.config}-gcc";
+  };
+
   src = fetchurl {
     url = http://vicerveza.homeunix.net/~viric/soft/tm/tm-0.4.1.tar.gz;
     sha256 = "3b389bc03b6964ad5ffa57a344b891fdbcf7c9b2604adda723a863f83657c4a0";
diff --git a/pkgs/tools/system/ts/default.nix b/pkgs/tools/system/ts/default.nix
index 80778a3546a..032b37a3868 100644
--- a/pkgs/tools/system/ts/default.nix
+++ b/pkgs/tools/system/ts/default.nix
@@ -6,6 +6,10 @@ stdenv.mkDerivation {
 
   installPhase=''make install "PREFIX=$out"'';
 
+  crossAttrs = {
+    makeFlags = "CC=${stdenv.cross.config}-gcc";
+  };
+
   src = fetchurl {
     url = http://vicerveza.homeunix.net/~viric/soft/ts/ts-0.6.6.tar.gz;
     sha256 = "0mdg123ppq8ibf4315l4qi0w3n7wlj4x8dq5gx8f680v4bjvc30g";