diff --git a/arch/arm/src/stm32/stm32_rtc_lowerhalf.c b/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
index 1a7c1e27d3c..7c4aaf221b5 100644
--- a/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
+++ b/arch/arm/src/stm32/stm32_rtc_lowerhalf.c
@@ -118,6 +118,7 @@ static const struct rtc_ops_s g_rtc_ops =
   .rdwkalm    = NULL,
   .setwkalm   = NULL,
 #endif
+  .ioctl      = NULL,
   .destroy    = NULL,
 };