diff --git a/tools/check-license.py b/tools/check-license.py
index 81a2fd28b..76573d6f7 100755
--- a/tools/check-license.py
+++ b/tools/check-license.py
@@ -43,6 +43,7 @@ INCLUDE_DIRS = [
     'jerry-libc',
     'jerry-libm',
     'jerry-main',
+    'jerry-port',
     'targets',
     'tests',
     'tools',