diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index bae5e4cb90..39fa4b8a56 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -226,6 +226,6 @@ module Homebrew
     contents = Utils::Git.last_revision_of_file(repo, file, before_commit: rev)
     contents.gsub!("@url=", "url ")
     contents.gsub!("require 'brewkit'", "require 'formula'")
-    with_monkey_patch { Formulary.from_contents(name, file, contents) }
+    with_monkey_patch { Formulary.from_contents(name, file, contents, ignore_errors: true) }
   end
 end
diff --git a/Library/Homebrew/test/dev-cmd/extract_spec.rb b/Library/Homebrew/test/dev-cmd/extract_spec.rb
index 214db27b9f..20f745e49a 100644
--- a/Library/Homebrew/test/dev-cmd/extract_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/extract_spec.rb
@@ -14,9 +14,17 @@ describe "brew extract" do
       core_tap = CoreTap.new
       core_tap.path.cd do
         system "git", "init"
-        formula_file = setup_test_formula "testball"
+        # Start with deprecated bottle syntax
+        setup_test_formula "testball", bottle_block: <<~EOS
+
+          bottle do
+            cellar :any
+          end
+        EOS
         system "git", "add", "--all"
         system "git", "commit", "-m", "testball 0.1"
+        # Replace with a valid formula for the next version
+        formula_file = setup_test_formula "testball"
         contents = File.read(formula_file)
         contents.gsub!("testball-0.1", "testball-0.2")
         File.write(formula_file, contents)