diff --git a/railties/lib/rails/tasks/zeitwerk.rake b/railties/lib/rails/tasks/zeitwerk.rake
index f69eaf10d65b0c2d6b7a13d8d0cd096082d301ed..a2e3524c4eea7fec72a8f8966a3a2cf70b83b6ad 100644
--- a/railties/lib/rails/tasks/zeitwerk.rake
+++ b/railties/lib/rails/tasks/zeitwerk.rake
@@ -46,7 +46,7 @@ namespace :zeitwerk do
     begin
       eager_load[]
     rescue NameError => e
-      if e.message =~ /expected file .*? to define constant \S+/
+      if e.message =~ /expected file .*? to define constant [\w:]+/
         abort $&.sub(/expected file #{Regexp.escape(Rails.root.to_s)}./, "expected file ")
       else
         raise