diff --git a/drivers/rtc/rtc_dw.c b/drivers/rtc/rtc_dw.c
index b09e30891ae..9e2a1cd8615 100644
--- a/drivers/rtc/rtc_dw.c
+++ b/drivers/rtc/rtc_dw.c
@@ -24,7 +24,7 @@
 
 #include "rtc_dw.h"
 
-#define CLK_RTC_DIV_DEF_MASK (0xFFFFFF83)
+#define RTC_CLK_DIV_DEF_MASK (0xFFFFFF83)
 #define CCU_RTC_CLK_DIV_EN (2)
 
 #ifdef RTC_DW_INT_MASK
@@ -76,7 +76,7 @@ static void rtc_dw_set_div(const enum clk_rtc_div div)
 {
 	/* set default division mask */
 	uint32_t reg =
-		sys_read32(CLOCK_SYSTEM_CLOCK_CONTROL) & CLK_RTC_DIV_DEF_MASK;
+		sys_read32(CLOCK_SYSTEM_CLOCK_CONTROL) & RTC_CLK_DIV_DEF_MASK;
 	reg |= (div << CCU_RTC_CLK_DIV_OFFSET);
 	sys_write32(reg, CLOCK_SYSTEM_CLOCK_CONTROL);
 	/* CLK Div en bit must be written from 0 -> 1 to apply new value */
diff --git a/include/rtc.h b/include/rtc.h
index 676251a33b7..775c5b669ea 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -21,31 +21,28 @@
 #include <misc/util.h>
 
 enum clk_rtc_div {
-	CLK_RTC_DIV_1,
-	CLK_RTC_DIV_2,
-	CLK_RTC_DIV_4,
-	CLK_RTC_DIV_8,
-	CLK_RTC_DIV_16,
-	CLK_RTC_DIV_32,
-	CLK_RTC_DIV_64,
-	CLK_RTC_DIV_128,
-	CLK_RTC_DIV_256,
-	CLK_RTC_DIV_512,
-	CLK_RTC_DIV_1024,
-	CLK_RTC_DIV_2048,
-	CLK_RTC_DIV_4096,
-	CLK_RTC_DIV_8192,
-	CLK_RTC_DIV_16384,
-	CLK_RTC_DIV_32768
+	RTC_CLK_DIV_1,
+	RTC_CLK_DIV_2,
+	RTC_CLK_DIV_4,
+	RTC_CLK_DIV_8,
+	RTC_CLK_DIV_16,
+	RTC_CLK_DIV_32,
+	RTC_CLK_DIV_64,
+	RTC_CLK_DIV_128,
+	RTC_CLK_DIV_256,
+	RTC_CLK_DIV_512,
+	RTC_CLK_DIV_1024,
+	RTC_CLK_DIV_2048,
+	RTC_CLK_DIV_4096,
+	RTC_CLK_DIV_8192,
+	RTC_CLK_DIV_16384,
+	RTC_CLK_DIV_32768
 };
-#ifndef BIT
-#define BIT(n)  (1UL << (n))
-#endif
 
-#define RTC_DIVIDER CLK_RTC_DIV_1
+#define RTC_DIVIDER RTC_CLK_DIV_1
 
 /** Number of RTC ticks in a second */
-#define RTC_ALARM_SECOND (32768 / BIT(RTC_DIVIDER))
+#define RTC_ALARM_SECOND (32768 / (1UL << RTC_DIVIDER))
 
 /** Number of RTC ticks in a minute */
 #define RTC_ALARM_MINUTE (RTC_ALARM_SECOND * 60)