diff --git a/pkgs/tools/system/acpica-tools/default.nix b/pkgs/tools/system/acpica-tools/default.nix
index edb7828f95b..c9a33bc64e0 100644
--- a/pkgs/tools/system/acpica-tools/default.nix
+++ b/pkgs/tools/system/acpica-tools/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "acpica-tools-${version}";
-  version = "20180508";
+  version = "20180531";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "1n7lqmv77kg28drahvxzybwl9v4hzwi8i7xkpgliclfcp5ff909b";
+    sha256 = "0rbn0anxs6r1ks1lgaxqhiv2kqgh4f1fq5qi2kdv7hir82mdqv4g";
   };
 
   NIX_CFLAGS_COMPILE = "-O3";