diff --git a/components/ulp/lp_core/shared/include/ulp_lp_core_cpu_freq_shared.h b/components/ulp/lp_core/shared/include/ulp_lp_core_cpu_freq_shared.h
index 3c0970a6a77..b690a9186a1 100644
--- a/components/ulp/lp_core/shared/include/ulp_lp_core_cpu_freq_shared.h
+++ b/components/ulp/lp_core/shared/include/ulp_lp_core_cpu_freq_shared.h
@@ -6,13 +6,14 @@
 #pragma once
 
 #include "sdkconfig.h"
+#include "soc/clk_tree_defs.h"
 #include "soc/soc_caps.h"
 
 /* LP_FAST_CLK is not very accurate, for now use a rough estimate */
 #if CONFIG_RTC_FAST_CLK_SRC_RC_FAST
-#define LP_CORE_CPU_FREQUENCY_HZ 16000000U /* For P4 TRM says 20 MHz by default, but we tune it closer to 16 MHz */
-#define LP_CORE_CYCLES_PER_US_NUM 16U
-#define LP_CORE_CYCLES_PER_US_DENOM 1U
+#define LP_CORE_CPU_FREQUENCY_HZ SOC_CLK_RC_FAST_FREQ_APPROX
+#define LP_CORE_CYCLES_PER_US_NUM (SOC_CLK_RC_FAST_FREQ_APPROX / 500000U)
+#define LP_CORE_CYCLES_PER_US_DENOM 2U
 #elif CONFIG_RTC_FAST_CLK_SRC_XTAL
 #if SOC_XTAL_SUPPORT_48M
 #define LP_CORE_CPU_FREQUENCY_HZ 48000000U