diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index e4ec708c0b..41d31be6a9 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -259,7 +259,7 @@ module Homebrew
 
     formulae.each do |f|
       Migrator.migrate_if_needed(f)
-      forbidden_license_check(f) unless ENV["HOMEBREW_FORBIDDEN_LICENSES"].blank?
+      forbidden_license_check(f)
       install_formula(f)
       Cleanup.install_formula_clean!(f)
     end
@@ -348,6 +348,8 @@ module Homebrew
   end
 
   def forbidden_license_check(f)
+    return if ENV["HOMEBREW_FORBIDDEN_LICENSES"].blank?
+
     forbidden_licenses = env_forbidden_licenses
 
     if forbidden_licenses.include? f.license
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 7a9da2a595..73f452eca0 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -149,7 +149,7 @@ class FormulaInstaller
   def prelude
     Tab.clear_cache
     verify_deps_exist unless ignore_deps?
-    Homebrew.forbidden_license_check(formula) unless ENV["HOMEBREW_FORBIDDEN_LICENSES"].blank?
+    Homebrew.forbidden_license_check(formula)
 
     check_install_sanity
   end