diff --git a/Library/Homebrew/requirements/python_dependency.rb b/Library/Homebrew/requirements/python_dependency.rb
index b16018ca95..e5e75abf7a 100644
--- a/Library/Homebrew/requirements/python_dependency.rb
+++ b/Library/Homebrew/requirements/python_dependency.rb
@@ -14,7 +14,7 @@ class PythonDependency < Requirement
   end
 
   def pour_bottle?
-    system_python?
+    tags.include?(:build) || system_python?
   end
 
   def modify_build_environment