diff --git a/wire/fiber/fiber.ts b/wire/fiber/fiber.ts
index 75573ea1fa..706643d34d 100644
--- a/wire/fiber/fiber.ts
+++ b/wire/fiber/fiber.ts
@@ -181,11 +181,15 @@ namespace $ {
 				
 				if( $mol_promise_like( result ) && !handled.has( result ) ) {
 					
+					handled.add( result )
 					const put = ( res: Result )=> {
 						if( this.cache === result ) this.put( res )
 						return res
 					}
-					result = result.then( put, put )
+					result = Object.assign(
+						result.then( put, put ),
+						{ destructor: ( result as any ).destructor }
+					)
 					
 				}
 				
@@ -199,9 +203,13 @@ namespace $ {
 				
 				if( $mol_promise_like( result ) && !handled.has( result ) ) {
 					
-					result = result.finally( ()=> {
-						if( this.cache === result ) this.absorb()
-					} )
+					handled.add( result )
+					result = Object.assign(
+						result.finally( ()=> {
+							if( this.cache === result ) this.absorb()
+						} ),
+						{ destructor: ( result as any ).destructor }
+					) 
 					
 				}