diff --git a/lib/async/io/shared_endpoint.rb b/lib/async/io/shared_endpoint.rb
index a929459..a259359 100644
--- a/lib/async/io/shared_endpoint.rb
+++ b/lib/async/io/shared_endpoint.rb
@@ -24,7 +24,10 @@ def self.bound(endpoint, backlog: Socket::SOMAXCONN, close_on_exec: false, **opt
 					end
 					
 					server.close_on_exec = close_on_exec
-					server.reactor = nil
+					
+					if server.respond_to?(:reactor=)
+						server.reactor = nil
+					end
 				end
 				
 				return self.new(endpoint, wrappers)
@@ -35,7 +38,10 @@ def self.connected(endpoint, close_on_exec: false)
 				wrapper = endpoint.connect
 				
 				wrapper.close_on_exec = close_on_exec
-				wrapper.reactor = nil
+				
+				if wrapper.respond_to?(:reactor=)
+					wrapper.reactor = nil
+				end
 				
 				return self.new(endpoint, [wrapper])
 			end