diff --git a/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-010.js b/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-010.js
index fe8c2f251..bd88fcbd7 100644
--- a/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-010.js
+++ b/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-010.js
@@ -12,6 +12,5 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var a = new String('example')
-var c = toString in a
-assert(!c)
\ No newline at end of file
+var a = new String('example');
+assert('toString' in a);
diff --git a/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-012.js b/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-012.js
index fe8c2f251..f2b9c7e6d 100644
--- a/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-012.js
+++ b/tests/jerry-test-suite/11/11.08/11.08.07/11.08.07-012.js
@@ -12,6 +12,5 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var a = new String('example')
-var c = toString in a
-assert(!c)
\ No newline at end of file
+var a = new String('example');
+assert(!('toString.' in a));
diff --git a/tests/jerry-test-suite/15/15.05/15.05.04/15.05.04.07/15.05.04.07-003.js b/tests/jerry-test-suite/15/15.05/15.05.04/15.05.04.07/15.05.04.07-003.js
index 0ae45b8b6..e66a41966 100644
--- a/tests/jerry-test-suite/15/15.05/15.05.04/15.05.04.07/15.05.04.07-003.js
+++ b/tests/jerry-test-suite/15/15.05/15.05.04/15.05.04.07/15.05.04.07-003.js
@@ -12,4 +12,4 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-assert(string("abcd").indexOf("ab", 1) === -1 ? 1 : 0);
+assert(String("abcd").indexOf("ab", 1) === -1 ? 1 : 0);