diff --git a/pkgs/development/compilers/llvm/4.0/clang/default.nix b/pkgs/development/compilers/llvm/4.0/clang/default.nix
index d482f91cb83a..f566cd6d21c2 100644
--- a/pkgs/development/compilers/llvm/4.0/clang/default.nix
+++ b/pkgs/development/compilers/llvm/4.0/clang/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetch, cmake, libxml2, libedit, llvm, version, clang-tools-extra_src, python }:
+{ stdenv, fetch, cmake, libxml2, libedit, llvm, version, release_version, clang-tools-extra_src, python }:
 
 let
   gcc = if stdenv.cc.isGNU then stdenv.cc.cc else stdenv.cc.cc.gcc;
@@ -33,7 +33,7 @@ let
     # Clang expects to find sanitizer libraries in its own prefix
     postInstall = ''
       ln -sv ${llvm}/lib/LLVMgold.so $out/lib
-      ln -sv ${llvm}/lib/clang/${version}/lib $out/lib/clang/${version}/
+      ln -sv ${llvm}/lib/clang/${release_version}/lib $out/lib/clang/${release_version}/
       ln -sv $out/bin/clang $out/bin/cpp
     '';
 
diff --git a/pkgs/development/compilers/llvm/4.0/default.nix b/pkgs/development/compilers/llvm/4.0/default.nix
index a239825533eb..f407b2cdc9f5 100644
--- a/pkgs/development/compilers/llvm/4.0/default.nix
+++ b/pkgs/development/compilers/llvm/4.0/default.nix
@@ -1,15 +1,15 @@
 { newScope, stdenv, isl, fetchurl, overrideCC, wrapCC, darwin, ccWrapperFun }:
 let
-  callPackage = newScope (self // { inherit stdenv isl version fetch; });
+  callPackage = newScope (self // { inherit stdenv isl release_version version fetch; });
 
-  version = "4.0.0";
+  release_version = "4.0.0";
   rc = "rc2";
+  version = "${release_version}${rc}";
 
-  fetch = fetch_v version;
-  fetch_v = ver: name: sha256: fetchurl {
-    url = "http://llvm.org/pre-releases/${version}/${rc}/${name}-${version}${rc}.src.tar.xz";
+  fetch = name: sha256: fetchurl {
+    url = "http://llvm.org/pre-releases/${release_version}/${rc}/${name}-${version}.src.tar.xz";
     # Once 4.0 is released, use this instead:
-    # url = "http://llvm.org/releases/${version}/${name}-${ver}.src.tar.xz";
+    # url = "http://llvm.org/releases/${release-version}/${name}-${version}.src.tar.xz";
     inherit sha256;
   };
 
diff --git a/pkgs/development/compilers/llvm/4.0/llvm.nix b/pkgs/development/compilers/llvm/4.0/llvm.nix
index 0139f40791cc..d54390e5ee8d 100644
--- a/pkgs/development/compilers/llvm/4.0/llvm.nix
+++ b/pkgs/development/compilers/llvm/4.0/llvm.nix
@@ -11,6 +11,7 @@
 , valgrind
 , ncurses
 , version
+, release_version
 , zlib
 , compiler-rt_src
 , libcxxabi
@@ -25,7 +26,7 @@ let
 
   # Used when creating a version-suffixed symlink of libLLVM.dylib
   shortVersion = with stdenv.lib;
-    concatStringsSep "." (take 2 (splitString "." version));
+    concatStringsSep "." (take 2 (splitString "." release_version));
 in stdenv.mkDerivation rec {
   name = "llvm-${version}";
 
@@ -99,7 +100,7 @@ in stdenv.mkDerivation rec {
     install_name_tool -id $lib/lib/libLLVM.dylib $lib/lib/libLLVM.dylib
     install_name_tool -change @rpath/libLLVM.dylib $lib/lib/libLLVM.dylib $out/bin/llvm-config
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
-    ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${version}.dylib
+    ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
   '';
 
   enableParallelBuilding = true;