diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index c88b0b9412..e391f08b9c 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -188,11 +188,14 @@ module Homebrew
         files = Dir.chdir(dir) do
           (Dir.glob(pattern) - Dir.glob(allow_list))
             .select { |f| File.file?(f) && !File.symlink?(f) }
-            .map { |f| File.join(dir, f) }
+            .map do |f|
+              f.sub!(%r{/.*}, "/...") unless @verbose
+              File.join(dir, f)
+            end
         end
         return if files.empty?
 
-        inject_file_list(files.sort, message)
+        inject_file_list(files.sort.uniq, message)
       end
 
       def check_for_stray_dylibs