diff --git a/js/src/tests/js1_8_5/regress/regress-555246-0.js b/js/src/tests/js1_8_5/regress/regress-555246-0.js
index 86acca0334e..51a46a6d0c0 100644
--- a/js/src/tests/js1_8_5/regress/regress-555246-0.js
+++ b/js/src/tests/js1_8_5/regress/regress-555246-0.js
@@ -4,8 +4,11 @@
  * Contributor: Jason Orendorff
  */
 
-var cx = evalcx("");
-evalcx("function f() { return this; }", cx);
-var f = cx.f;
-assertEq(f(), cx);
+if (typeof evalcx != 'function') {
+  var cx = evalcx("");
+  evalcx("function f() { return this; }", cx);
+  var f = cx.f;
+  assertEq(f(), cx);
+}
+
 reportCompare(0, 0, "");
diff --git a/js/src/tests/js1_8_5/regress/regress-555246-1.js b/js/src/tests/js1_8_5/regress/regress-555246-1.js
index 6bd0195d833..af3f3e1205c 100644
--- a/js/src/tests/js1_8_5/regress/regress-555246-1.js
+++ b/js/src/tests/js1_8_5/regress/regress-555246-1.js
@@ -4,6 +4,7 @@
  * Contributor: Jason Orendorff
  */
 
+assertEq(typeof evalcx, "function", "")
 var cx = evalcx("");
 evalcx("function f() { return this; }", cx);
 f = cx.f;