1 files changed, 4 insertions, 2 deletions
diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index a32f2ef34..1808c4d9c 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -194,8 +194,10 @@ module Homebrew
         next unless f.opt_prefix.directory?
         keg = Keg.new(f.opt_prefix.resolved_path)
         tab = Tab.for_keg(keg)
-        tab.installed_on_request = true
-        tab.write
+        unless tab.installed_on_request
+          tab.installed_on_request = true
+          tab.write
+        end
       end
 
       perform_preinstall_checks