diff --git a/targets/targets.json b/targets/targets.json
index b53fdbeb48..263fce50b0 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -8590,6 +8590,7 @@
             "PORTINOUT",
             "PORTOUT",
             "PWMOUT",
+            "RESET_REASON",
             "SERIAL",
             "SLEEP",
             "SPI",