diff --git a/integration_tests/run_tests.py b/integration_tests/run_tests.py
index cfa2984d67..e563d92434 100755
--- a/integration_tests/run_tests.py
+++ b/integration_tests/run_tests.py
@@ -15,11 +15,12 @@
     "modules_01.py",
     #"modules_02.py",
     "test_math.py",
-    #"test_builtin.py",
+    "test_builtin.py",
     "test_builtin_abs.py",
     "test_builtin_bool.py",
     "test_builtin_pow.py",
     "test_builtin_int.py",
+    "test_builtin_len.py",
     "test_builtin_float.py",
     "test_math1.py",
     "test_math_02.py",