diff --git a/components/soc/esp32c3/include/soc/soc_caps.h b/components/soc/esp32c3/include/soc/soc_caps.h
index e61cf8493d..deb0d8cd24 100644
--- a/components/soc/esp32c3/include/soc/soc_caps.h
+++ b/components/soc/esp32c3/include/soc/soc_caps.h
@@ -143,7 +143,7 @@
 /*-------------------------- RTCIO CAPS --------------------------------------*/
 /* No dedicated RTCIO subsystem on ESP32-C3. RTC functions are still supported
  * for hold, wake & 32kHz crystal functions - via rtc_cntl_reg */
-#define SOC_RTCIO_PIN_COUNT    0
+#define SOC_RTCIO_PIN_COUNT    (0U)
 
 /*--------------------------- RSA CAPS ---------------------------------------*/
 #define SOC_RSA_MAX_BIT_LEN    (3072)