--- a/lib/unicode/display_width/constants.rb
+++ b/lib/unicode/display_width/constants.rb
@@ -4,7 +4,8 @@ module Unicode
   class DisplayWidth
     VERSION = "3.2.0"
     UNICODE_VERSION = "17.0.0"
-    DATA_DIRECTORY = File.expand_path(File.dirname(__FILE__) + "/../../../data/")
+    DEBIAN_DATA_DIRECTORY = '/usr/share/ruby-unicode-display-width/'
+    DATA_DIRECTORY = (File.directory?(DEBIAN_DATA_DIRECTORY) ? DEBIAN_DATA_DIRECTORY : File.expand_path(File.dirname(__FILE__) + '/../../../data/')).freeze
     INDEX_FILENAME = DATA_DIRECTORY + "/display_width.marshal.gz"
   end
 end