diff --git a/pkgs/development/compilers/iasl/default.nix b/pkgs/development/compilers/iasl/default.nix
index 22f80ae559f..a514672016f 100644
--- a/pkgs/development/compilers/iasl/default.nix
+++ b/pkgs/development/compilers/iasl/default.nix
@@ -2,14 +2,18 @@
 
 stdenv.mkDerivation rec {
   name = "iasl-${version}";
-  version = "20180313";
+  version = "20180508";
 
   src = fetchurl {
     url = "https://acpica.org/sites/acpica/files/acpica-unix-${version}.tar.gz";
-    sha256 = "05ab2xfv9wqwbzjaa9xqgrvvan87rxv29hw48h1gcckpc5smp2wm";
+    sha256 = "1n7lqmv77kg28drahvxzybwl9v4hzwi8i7xkpgliclfcp5ff909b";
   };
 
-  NIX_CFLAGS_COMPILE = "-O3";
+  NIX_CFLAGS_COMPILE = [
+    "-O3"
+    # See: https://github.com/acpica/acpica/issues/387:
+    "-Wno-error=format-overflow"
+  ];
 
   buildFlags = "iasl";