diff --git a/pkgs/os-specific/linux/dietlibc-wrapper/builder.sh b/pkgs/os-specific/linux/dietlibc-wrapper/builder.sh
index 5f941e2e704..976cebada83 100644
--- a/pkgs/os-specific/linux/dietlibc-wrapper/builder.sh
+++ b/pkgs/os-specific/linux/dietlibc-wrapper/builder.sh
@@ -1,11 +1,10 @@
 source $stdenv/setup
 
-#export NIX_GLIBC_FLAGS_SET=1
-
 ensureDir "$(dirname $out/bin/diet)"
 
 cat > $out/bin/gcc << END
 #! $SHELL -e
+export NIX_GLIBC_FLAGS_SET=1
 exec $dietlibc/bin/diet $gcc/bin/gcc "\$@"
 END
 
diff --git a/pkgs/tools/misc/coreutils-diet/default.nix b/pkgs/tools/misc/coreutils-diet/default.nix
index 82bfd235669..d372c7ec949 100644
--- a/pkgs/tools/misc/coreutils-diet/default.nix
+++ b/pkgs/tools/misc/coreutils-diet/default.nix
@@ -11,6 +11,5 @@ stdenv.mkDerivation {
   patches = [./coreutils-dummy.patch];
   buildInputs = [perl];
   NIX_GCC = dietgcc;
-  NIX_GLIBC_FLAGS_SET=1;
   NIX_CFLAGS_COMPILE="-D_BSD_SOURCE=1";
 }