diff --git a/drivers/rtt_rtc/Kconfig b/drivers/rtt_rtc/Kconfig
index 68cbf8c42c..93c0227600 100644
--- a/drivers/rtt_rtc/Kconfig
+++ b/drivers/rtt_rtc/Kconfig
@@ -10,5 +10,6 @@ config MODULE_RTT_RTC
     depends on HAS_PERIPH_RTT
     depends on TEST_KCONFIG
     select MODULE_PERIPH_RTT
+    select MODULE_RTC_UTILS
     help
         Basic RTC implementation based on a RTT.
diff --git a/drivers/rtt_rtc/Makefile.dep b/drivers/rtt_rtc/Makefile.dep
index f8141a0a55..ff0e6305f5 100644
--- a/drivers/rtt_rtc/Makefile.dep
+++ b/drivers/rtt_rtc/Makefile.dep
@@ -2,3 +2,5 @@
 ifeq (,$(UNIT_TESTS))
   FEATURES_REQUIRED += periph_rtt
 endif
+
+USEMODULE += rtc_utils
diff --git a/makefiles/features_modules.inc.mk b/makefiles/features_modules.inc.mk
index 9c3785c3f3..3fb6eccf6f 100644
--- a/makefiles/features_modules.inc.mk
+++ b/makefiles/features_modules.inc.mk
@@ -52,7 +52,7 @@ ifneq (,$(filter periph_%, $(USEMODULE)))
 endif
 
 # include rtc_utils if periph_rtc is used
-ifneq (,$(filter periph_rtc, $(USEMODULE)))
+ifneq (,$(filter periph_rtc,$(USEMODULE)))
   USEMODULE += rtc_utils
 endif