diff --git a/activesupport/lib/active_support/core_ext/load_error.rb b/activesupport/lib/active_support/core_ext/load_error.rb
index f36a21818f718457a5799cd5d582d0b705ecf990..cc6287b1005c766d0d6fe3751e4433f106bc59eb 100644
--- a/activesupport/lib/active_support/core_ext/load_error.rb
+++ b/activesupport/lib/active_support/core_ext/load_error.rb
@@ -20,7 +20,8 @@ def self.from_message(message)
   REGEXPS = [
     [/^no such file to load -- (.+)$/i, 1],
     [/^Missing \w+ (file\s*)?([^\s]+.rb)$/i, 2],
-    [/^Missing API definition file in (.+)$/i, 1]
+    [/^Missing API definition file in (.+)$/i, 1],
+    [/win32/, 0]
   ] unless defined?(REGEXPS)
 end