diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dfa2a3b66967..ac3a5a2b5ed9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9711,8 +9711,8 @@ with pkgs;
   isocodes = callPackage ../development/libraries/iso-codes { };
 
   ispc = callPackage ../development/compilers/ispc {
-    llvmPackages = llvmPackages_4;
-    stdenv = llvmPackages_4.stdenv;
+    llvmPackages = llvmPackages_6;
+    stdenv = llvmPackages_6.stdenv;
   };
 
   isso = callPackage ../servers/isso { };