diff --git a/Library/Homebrew/brew.rb b/Library/Homebrew/brew.rb
index c3e7d9aa5c6be..cc7e5d2780af7 100644
--- a/Library/Homebrew/brew.rb
+++ b/Library/Homebrew/brew.rb
@@ -97,10 +97,6 @@ class MissingEnvironmentVariables < RuntimeError; end
     system(HOMEBREW_BREW_FILE, "uninstall", "--force", "brew-cask")
   end
 
-  if ENV["HOMEBREW_BUILD_FROM_SOURCE"]
-    odeprecated("HOMEBREW_BUILD_FROM_SOURCE", "--build-from-source")
-  end
-
   if internal_cmd
     Homebrew.send cmd.to_s.tr("-", "_").downcase
   elsif which "brew-#{cmd}"