diff --git a/jerry-core/ecma/base/ecma-module.c b/jerry-core/ecma/base/ecma-module.c
index 489943a264..b43d5d6d42 100644
--- a/jerry-core/ecma/base/ecma-module.c
+++ b/jerry-core/ecma/base/ecma-module.c
@@ -700,7 +700,7 @@ ecma_module_parse (ecma_module_t *module_p) /**< module */
                                                 0,
                                                 (jerry_char_t *) source_p,
                                                 source_size,
-                                                JERRY_PARSE_NO_OPTS,
+                                                JERRY_PARSE_STRICT_MODE,
                                                 &bytecode_data_p);
 
   JERRY_CONTEXT (module_top_context_p) = module_p->context_p->parent_p;
diff --git a/tests/jerry/es2015/module-export-07.js b/tests/jerry/es2015/module-export-07.js
index c8bab81a59..39dea13eed 100644
--- a/tests/jerry/es2015/module-export-07.js
+++ b/tests/jerry/es2015/module-export-07.js
@@ -13,4 +13,5 @@
  * limitations under the License.
  */
 
+var y, z;
 export default x = y = z = "default";
diff --git a/tests/jerry/es2015/module-import-01.js b/tests/jerry/es2015/module-import-01.js
index 21762995ab..6f738366aa 100644
--- a/tests/jerry/es2015/module-import-01.js
+++ b/tests/jerry/es2015/module-import-01.js
@@ -29,5 +29,5 @@ assert (Array.isArray(mod.d))
 assert (x === 42)
 assert (mod.f("str") === "str")
 
-dog = new mod.Dog("Oddie")
+var dog = new mod.Dog("Oddie")
 assert (dog.speak() === "Oddie barks.")
diff --git a/tests/jerry/es2015/module-import-04.js b/tests/jerry/es2015/module-import-04.js
index 468c3dc362..34a6e693e1 100644
--- a/tests/jerry/es2015/module-import-04.js
+++ b/tests/jerry/es2015/module-import-04.js
@@ -14,3 +14,6 @@
  */
 
 import "tests/jerry/es2015/module-import-01.js"
+import "tests/jerry/es2015/module-export-05.js"
+import "tests/jerry/es2015/module-export-06.js"
+import "tests/jerry/es2015/module-export-07.js"