2 files changed, 4 insertions, 4 deletions
diff --git a/toolkit/components/osfile/modules/osfile_unix_front.jsm b/toolkit/components/osfile/modules/osfile_unix_front.jsm
index 19a27ae1aa..bd60d4d841 100644
--- a/toolkit/components/osfile/modules/osfile_unix_front.jsm
+++ b/toolkit/components/osfile/modules/osfile_unix_front.jsm
@@ -838,7 +838,7 @@
       * implementation.
       */
      File.DirectoryIterator.Entry.toMsg = function toMsg(value) {
-       if (!value instanceof File.DirectoryIterator.Entry) {
+       if (!(value instanceof File.DirectoryIterator.Entry)) {
          throw new TypeError("parameter of " +
            "File.DirectoryIterator.Entry.toMsg must be a " +
            "File.DirectoryIterator.Entry");
@@ -905,7 +905,7 @@
       * is asymmetric and returns an object with a different implementation.
       */
      File.Info.toMsg = function toMsg(stat) {
-       if (!stat instanceof File.Info) {
+       if (!(stat instanceof File.Info)) {
          throw new TypeError("parameter of File.Info.toMsg must be a File.Info");
        }
        let serialized = {};
diff --git a/toolkit/components/osfile/modules/osfile_win_front.jsm b/toolkit/components/osfile/modules/osfile_win_front.jsm
index 387dd08b56..1123b251ca 100644
--- a/toolkit/components/osfile/modules/osfile_win_front.jsm
+++ b/toolkit/components/osfile/modules/osfile_win_front.jsm
@@ -909,7 +909,7 @@
       * implementation.
       */
      File.DirectoryIterator.Entry.toMsg = function toMsg(value) {
-       if (!value instanceof File.DirectoryIterator.Entry) {
+       if (!(value instanceof File.DirectoryIterator.Entry)) {
          throw new TypeError("parameter of " +
            "File.DirectoryIterator.Entry.toMsg must be a " +
            "File.DirectoryIterator.Entry");
@@ -958,7 +958,7 @@
       * is asymmetric and returns an object with a different implementation.
       */
      File.Info.toMsg = function toMsg(stat) {
-       if (!stat instanceof File.Info) {
+       if (!(stat instanceof File.Info)) {
          throw new TypeError("parameter of File.Info.toMsg must be a File.Info");
        }
        let serialized = {};