diff --git a/test/mjsunit/object-define-property.js b/test/mjsunit/object-define-property.js
index ebdf89961e..4c495c6824 100644
--- a/test/mjsunit/object-define-property.js
+++ b/test/mjsunit/object-define-property.js
@@ -27,7 +27,7 @@
 
 // Tests the object.defineProperty method - ES 15.2.3.6
 
-// Flags: --allow-natives-syntax --es5-readonly
+// Flags: --allow-natives-syntax
 
 // Check that an exception is thrown when null is passed as object.
 var exception = false;
diff --git a/test/mjsunit/override-read-only-property.js b/test/mjsunit/override-read-only-property.js
index 2876ae1f84..f8114a6601 100644
--- a/test/mjsunit/override-read-only-property.js
+++ b/test/mjsunit/override-read-only-property.js
@@ -25,8 +25,6 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --es5_readonly
-
 // According to ECMA-262, sections 8.6.2.2 and 8.6.2.3 you're not
 // allowed to override read-only properties, not even if the read-only
 // property is in the prototype chain.
diff --git a/test/mjsunit/readonly.js b/test/mjsunit/readonly.js
index 050e256275..084e9ffe23 100644
--- a/test/mjsunit/readonly.js
+++ b/test/mjsunit/readonly.js
@@ -25,8 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax --es5_readonly
-// Flags: --harmony-proxies
+// Flags: --allow-natives-syntax --harmony-proxies
 
 // Different ways to create an object.
 
diff --git a/test/mjsunit/with-readonly.js b/test/mjsunit/with-readonly.js
index 29982b3474..43583348e9 100644
--- a/test/mjsunit/with-readonly.js
+++ b/test/mjsunit/with-readonly.js
@@ -27,8 +27,6 @@
 
 // Test that readonly variables are treated correctly.
 
-// Flags: --es5_readonly
-
 // Create an object with a read-only length property in the prototype
 // chain by putting the string split function in the prototype chain.
 var o = {};