diff --git a/Sources/Foundation/NSCFDictionary.swift b/Sources/Foundation/NSCFDictionary.swift
index 4d7269f588..46358baca8 100644
--- a/Sources/Foundation/NSCFDictionary.swift
+++ b/Sources/Foundation/NSCFDictionary.swift
@@ -71,7 +71,7 @@ internal final class _NSCFDictionary : NSMutableDictionary {
                 let key = unsafeBitCast(keys.advanced(by: idx).pointee!, to: NSObject.self)
                 keyArray.append(key)
             }
-            keys.deinitialize(count: 1)
+            keys.deinitialize(count: count)
             keys.deallocate()
         }
     }
diff --git a/Sources/Foundation/NSCFSet.swift b/Sources/Foundation/NSCFSet.swift
index 6b90fd71d7..19cf4fbfd3 100644
--- a/Sources/Foundation/NSCFSet.swift
+++ b/Sources/Foundation/NSCFSet.swift
@@ -58,7 +58,7 @@ internal final class _NSCFSet : NSMutableSet {
             let obj = unsafeBitCast(objects.advanced(by: idx).pointee!, to: AnyObject.self)
             objArray.append(obj)
         }
-        objects.deinitialize(count: 1)
+        objects.deinitialize(count: count)
         objects.deallocate()
         
         return NSGeneratorEnumerator(objArray.makeIterator())