diff --git a/lib/phusion_passenger/ruby_core_enhancements.rb b/lib/phusion_passenger/ruby_core_enhancements.rb

index 1f2924b..66a81c3 100644

--- a/lib/phusion_passenger/ruby_core_enhancements.rb

+++ b/lib/phusion_passenger/ruby_core_enhancements.rb

@@ -162,6 +162,7 @@ module Signal

 			result = Signal.list

 			result.delete("ALRM")

 			result.delete("VTALRM")

+			result.delete("KILL")

 		end

 		# Don't touch SIGCHLD no matter what! On OS X waitpid() will