diff --git a/Implab/Safe.cs b/Implab/Safe.cs
--- a/Implab/Safe.cs
+++ b/Implab/Safe.cs
@@ -79,7 +79,7 @@ namespace Implab
             if (obj is IDisposable) {
                 Dispose((IDisposable)obj);
             } else if (obj is IEnumerable) {
-                Dispose((IEnumerable)obj);
+                DisposeCollection((IEnumerable)obj);
             }
         }