diff --git a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
index b247dd88dc..beeeba3f3d 100755
--- a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
+++ b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
@@ -166,7 +166,7 @@
 #elif defined(TARGET_STM32F302R8)
 #    define OS_CLOCK       72000000
 
-#elif defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8) || defined(TARGET_STM32L152RE)
+#elif defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
 #    define OS_CLOCK       32000000
 
 #elif defined(TARGET_STM32F401VC)