diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 545098b073c..89f2ae1a19c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14228,9 +14228,9 @@ in
 
   xdotool = callPackage ../tools/X11/xdotool { };
 
-  xen_4_5_0 = callPackage ../applications/virtualization/xen/4.5.0.nix { };
-  xen_4_5_2 = callPackage ../applications/virtualization/xen/4.5.2.nix { };
-  xen_xenServer = callPackage ../applications/virtualization/xen/4.5.0.nix { xenserverPatched = true; };
+  xen_4_5_0 = callPackage ../applications/virtualization/xen/4.5.0.nix { stdenv = overrideCC stdenv gcc49; };
+  xen_4_5_2 = callPackage ../applications/virtualization/xen/4.5.2.nix { stdenv = overrideCC stdenv gcc49; };
+  xen_xenServer = callPackage ../applications/virtualization/xen/4.5.0.nix { xenserverPatched = true; stdenv = overrideCC stdenv gcc49; };
   xen = xen_4_5_2;
 
   win-spice = callPackage ../applications/virtualization/driver/win-spice { };