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