diff --git a/Formula/simgrid.rb b/Formula/simgrid.rb
index 9b99ccc9995..0e86470a639 100644
--- a/Formula/simgrid.rb
+++ b/Formula/simgrid.rb
@@ -10,7 +10,8 @@ class Simgrid < Formula
   depends_on 'graphviz'
 
   fails_with :clang do
-    build 318
+    build 425
+    cause "Undefined symbols for architecture x86_64"
   end
 
   def install