diff --git a/targets/targets.json b/targets/targets.json
index 17bc00b847..42ef9fb304 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -5093,7 +5093,8 @@
             "SPI",
             "STDIO_MESSAGES",
             "USTICKER",
-            "MPU"
+            "MPU",
+            "SLEEP"
         ],
         "release_versions": [
             "5"