diff --git a/Library/Homebrew/keg_relocate.rb b/Library/Homebrew/keg_relocate.rb
index 19e452b8f0..864e2f97ba 100644
--- a/Library/Homebrew/keg_relocate.rb
+++ b/Library/Homebrew/keg_relocate.rb
@@ -64,12 +64,14 @@ class Keg
     text_files = []
     return text_files unless File.exist?("/usr/bin/file")
 
-    path.find do |pn|
-      next if pn.symlink? || pn.directory?
-      next if Metafiles::EXTENSIONS.include? pn.extname
-      # File has known issues with reading files on other locales.
-      # http://bugs.gw.com/view.php?id=292
-      with_custom_locale("C") do
+    # file has known issues with reading files on other locales. Has
+    # been fixed upstream for some time, but a sufficiently new enough
+    # file with that fix is only available in macOS Sierra.
+    # http://bugs.gw.com/view.php?id=292
+    with_custom_locale("C") do
+      path.find do |pn|
+        next if pn.symlink? || pn.directory?
+        next if Metafiles::EXTENSIONS.include? pn.extname
         if Utils.popen_read("/usr/bin/file", "--brief", pn).include?("text") ||
            pn.text_executable?
           text_files << pn