diff --git a/bsc/apps/nbody/default.nix b/bsc/apps/nbody/default.nix
index 49e8597..8c5b37b 100644
--- a/bsc/apps/nbody/default.nix
+++ b/bsc/apps/nbody/default.nix
@@ -17,7 +17,8 @@ stdenv.mkDerivation rec {
   };
 
   patchPhase = ''
-    #sed -i 's/gcc/icc/g'  Makefile
+    sed -i 's/gcc/icc/g'  Makefile
+    export NIX_DEBUG=6
   '';
 
   buildInputs = [