diff --git a/test/staging/sm/statements/for-in-with-declaration.js b/test/staging/sm/statements/for-in-with-declaration.js
index 9d005af95d..9af62545cd 100644
--- a/test/staging/sm/statements/for-in-with-declaration.js
+++ b/test/staging/sm/statements/for-in-with-declaration.js
@@ -24,14 +24,14 @@ print(BUGNUMBER + ": " + summary);
  * BEGIN TEST *
  **************/
 
-assertThrowsInstanceOf(() => Function("for (var x = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (var x, y = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (var x = 5, y = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (const x = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (const x = 5, y = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (let x = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (let x, y = 3 in {}; ; ) break;"), SyntaxError);
-assertThrowsInstanceOf(() => Function("for (let x = 2, y = 3 in {}; ; ) break;"), SyntaxError);
+assert.throws(SyntaxError, () => Function("for (var x = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (var x, y = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (var x = 5, y = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (const x = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (const x = 5, y = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (let x = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (let x, y = 3 in {}; ; ) break;"));
+assert.throws(SyntaxError, () => Function("for (let x = 2, y = 3 in {}; ; ) break;"));
 
 /******************************************************************************/
 
diff --git a/test/staging/sm/statements/for-of-iterator-close.js b/test/staging/sm/statements/for-of-iterator-close.js
index bc4690a69a..253b73801a 100644
--- a/test/staging/sm/statements/for-of-iterator-close.js
+++ b/test/staging/sm/statements/for-of-iterator-close.js
@@ -95,10 +95,10 @@ function test() {
             }
         };
     };
-    assertThrowsInstanceOf(function() {
+    assert.throws(TypeError, function() {
         for (var x of iterable)
             break;
-    }, TypeError);
+    });
     assert.sameValue(returnCalled, ++returnCalledExpected);
 
     // continue doesn't call iter.return for the loop it's continuing
diff --git a/test/staging/sm/statements/for-of-iterator-primitive.js b/test/staging/sm/statements/for-of-iterator-primitive.js
index 1261e8eb97..527df3068a 100644
--- a/test/staging/sm/statements/for-of-iterator-primitive.js
+++ b/test/staging/sm/statements/for-of-iterator-primitive.js
@@ -29,9 +29,9 @@ for (let primitive of primitives) {
             return primitive;
         }
     };
-    assertThrowsInstanceOf(() => {
+    assert.throws(TypeError, () => {
         for (let x of obj) {
         }
-    }, TypeError);
+    });
 }