diff --git a/lib/bsd/capsicum.rb b/lib/bsd/capsicum.rb
index a40eb7c..64ca517 100644
--- a/lib/bsd/capsicum.rb
+++ b/lib/bsd/capsicum.rb
@@ -40,4 +40,5 @@ module BSD::Capsicum
     FFI.cap_enter.zero? ||
     raise(SystemCallError.new("cap_enter", Fiddle.last_error))
   end
+  alias_method :enter!, :enter_capability_mode!
 end