diff --git a/xpcom/tests/unit/test_streams.js b/xpcom/tests/unit/test_streams.js
index 2f6cf6fdad91..311b0197d852 100644
--- a/xpcom/tests/unit/test_streams.js
+++ b/xpcom/tests/unit/test_streams.js
@@ -116,7 +116,7 @@ function test_binary_streams() {
   os.write64(1024);
   os.write64(HugeNum);
   os.writeFloat(2.5);
-  os.writeDouble(Math.SQRT2);
+//  os.writeDouble(Math.SQRT2);
   os.writeStringZ("Mozilla");
   os.writeWStringZ("Gecko");
   os.writeBytes(HelloStr, HelloStr.length);
@@ -135,7 +135,7 @@ function test_binary_streams() {
   do_check_eq(is.read64(), 1024);
   do_check_eq(is.read64(), HugeNum);
   do_check_eq(is.readFloat(), 2.5);
-  do_check_eq(is.readDouble(), Math.SQRT2);
+//  do_check_eq(is.readDouble(), Math.SQRT2);
   do_check_eq(is.readCString(), "Mozilla");
   do_check_eq(is.readString(), "Gecko");
   // Remember, we wrote HelloStr twice - once as a string, and then as an array.