diff --git a/runtime/bin/process_patch.dart b/runtime/bin/process_patch.dart
index 9e374ae8b72..2de6ba608cd 100644
--- a/runtime/bin/process_patch.dart
+++ b/runtime/bin/process_patch.dart
@@ -451,6 +451,9 @@ class _ProcessImpl extends _ProcessImplNativeWrapper with _ServiceObject
       return encoding.decode(output);
     }
 
+    _stdin._sink.destroy();
+    _processes.remove(_serviceId);
+
     return new _ProcessResult(
         result[0],
         result[1],