diff --git a/boards/chronos/Makefile.features b/boards/chronos/Makefile.features
index 5f9d34a50e..a62395a350 100644
--- a/boards/chronos/Makefile.features
+++ b/boards/chronos/Makefile.features
@@ -1 +1 @@
-FEATURES_PROVIDED = transceiver periph_rtc
+FEATURES_PROVIDED += transceiver periph_rtc