diff --git a/pkgs/development/compilers/edk2/default.nix b/pkgs/development/compilers/edk2/default.nix
index 4b87beb08794..5cc4846d3ae5 100644
--- a/pkgs/development/compilers/edk2/default.nix
+++ b/pkgs/development/compilers/edk2/default.nix
@@ -58,13 +58,20 @@ edk2 = stdenv.mkDerivation {
 
       configurePhase = ''
         mkdir -v Conf
-        sed -e 's|Nt32Pkg/Nt32Pkg.dsc|${projectDscPath}|' -e \
-          's|MYTOOLS|GCC49|' -e 's|IA32|${targetArch}|' -e 's|DEBUG|RELEASE|'\
-          < ${edk2}/BaseTools/Conf/target.template > Conf/target.txt
-        sed -e 's|DEFINE GCC48_IA32_PREFIX       = /usr/bin/|DEFINE GCC48_IA32_PREFIX       = ""|' \
+
+        cp ${edk2}/BaseTools/Conf/target.template Conf/target.txt
+        sed -i Conf/target.txt \
+          -e 's|Nt32Pkg/Nt32Pkg.dsc|${projectDscPath}|' \
+          -e 's|MYTOOLS|GCC49|' \
+          -e 's|IA32|${targetArch}|' \
+          -e 's|DEBUG|RELEASE|'\
+
+        cp ${edk2}/BaseTools/Conf/tools_def.template Conf/tools_def.txt
+        sed -i Conf/tools_def.txt \
+          -e 's|DEFINE GCC48_IA32_PREFIX       = /usr/bin/|DEFINE GCC48_IA32_PREFIX       = ""|' \
           -e 's|DEFINE GCC48_X64_PREFIX        = /usr/bin/|DEFINE GCC48_X64_PREFIX        = ""|' \
-          -e 's|DEFINE UNIX_IASL_BIN           = /usr/bin/iasl|DEFINE UNIX_IASL_BIN           = ${iasl}/bin/iasl|' \
-          < ${edk2}/BaseTools/Conf/tools_def.template > Conf/tools_def.txt
+          -e 's|DEFINE UNIX_IASL_BIN           = /usr/bin/iasl|DEFINE UNIX_IASL_BIN           = ${iasl}/bin/iasl|'
+
         export WORKSPACE="$PWD"
         export EFI_SOURCE="$PWD/EdkCompatibilityPkg"
         ln -sv ${edk2}/BaseTools BaseTools