1 files changed, 1 insertions, 0 deletions
diff --git a/test/test_prime.rb b/test/test_prime.rb
index fe847eb832..7ff07eeb6a 100644
--- a/test/test_prime.rb
+++ b/test/test_prime.rb
@@ -189,6 +189,7 @@ class TestPrime < Test::Unit::TestCase
     ensure
       class << Integer
         alias_method :sqrt, :org_sqrt
+        remove_method :org_sqrt
       end
     end