diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 53e64fe8abc..3b105143c0b 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -495,8 +495,6 @@ stdenv.mkDerivation ({
 
   inherit (stdenv) is64bit;
 
-  setupHook = ./use-old-abi.sh;
-
   meta = {
     homepage = http://gcc.gnu.org/;
     license = stdenv.lib.licenses.gpl3Plus;  # runtime support libraries are typically LGPLv3+
diff --git a/pkgs/development/compilers/gcc/5/use-old-abi.sh b/pkgs/development/compilers/gcc/5/use-old-abi.sh
deleted file mode 100644
index 3a0c996033a..00000000000
--- a/pkgs/development/compilers/gcc/5/use-old-abi.sh
+++ /dev/null
@@ -1 +0,0 @@
-NIX_CFLAGS_COMPILE+=" -D_GLIBCXX_USE_CXX11_ABI=0"