diff --git a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
index 3fe584ae10..23697efa1e 100755
--- a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
+++ b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_CM_lib.h
@@ -274,7 +274,7 @@ osThreadDef_t os_thread_def_main = {(os_pthread)main, osPriorityNormal, 0, NULL}
 #elif defined(TARGET_STM32F410RB)
 #define INITIAL_SP            (0x20008000UL)
 
-#elif defined(TARGET_STM32F103RB)
+#elif defined(TARGET_STM32F103RB) || defined(TARGET_STM32L073RZ)
 #define INITIAL_SP            (0x20005000UL)
 
 #elif defined(TARGET_STM32F302R8)
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 70ac3c2f16..9dbbd49432 100755
--- a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
+++ b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
@@ -57,7 +57,7 @@
 #  elif defined(TARGET_LPC11U24) || defined(TARGET_STM32F303RE) || defined(TARGET_STM32F303K8) || defined(TARGET_LPC11U35_401)  || defined(TARGET_LPC11U35_501) || defined(TARGET_LPCCAPPUCCINO) || defined(TARGET_LPC1114) \
    || defined(TARGET_LPC812)   || defined(TARGET_KL25Z)         || defined(TARGET_KL26Z)         || defined(TARGET_KL05Z)        || defined(TARGET_STM32F100RB)  || defined(TARGET_STM32F051R8) \
    || defined(TARGET_STM32F103RB) || defined(TARGET_LPC824) || defined(TARGET_STM32F302R8) || defined(TARGET_STM32F334R8) || defined(TARGET_STM32F334C8) \
-   || defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8) || defined(TARGET_STM32F072RB) || defined(TARGET_STM32F091RC) || defined(TARGET_NZ32_SC151) \
+   || defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8) || defined(TARGET_STM32L073RZ) || defined(TARGET_STM32F072RB) || defined(TARGET_STM32F091RC) || defined(TARGET_NZ32_SC151) \
    || defined(TARGET_SSCI824)  || defined(TARGET_STM32F030R8) || defined(TARGET_STM32F070RB)
 #    define OS_TASKCNT         6
 #  else
@@ -77,7 +77,7 @@
    || defined(TARGET_STM32F103RB) || defined(TARGET_LPC824) || defined(TARGET_STM32F302R8) || defined(TARGET_STM32F072RB) || defined(TARGET_STM32F091RC) || defined(TARGET_NZ32_SC151) \
    || defined(TARGET_SSCI824) || defined(TARGET_STM32F030R8) || defined(TARGET_STM32F070RB)
 #      define OS_SCHEDULERSTKSIZE    128
-#  elif defined(TARGET_STM32F334R8) || defined(TARGET_STM32F303RE) ||  defined(TARGET_STM32F303K8) ||  defined(TARGET_STM32F334C8) || defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
+#  elif defined(TARGET_STM32F334R8) || defined(TARGET_STM32F303RE) ||  defined(TARGET_STM32F303K8) ||  defined(TARGET_STM32F334C8) || defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8) || defined(TARGET_STM32L073RZ)
 #      define OS_SCHEDULERSTKSIZE    112
 #  else
 #    error "no target defined"
@@ -172,7 +172,7 @@
 #elif defined(TARGET_STM32F302R8)
 #    define OS_CLOCK       72000000
 
-#elif defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8)
+#elif defined(TARGET_STM32L053R8) || defined(TARGET_STM32L053C8) || defined(TARGET_STM32L073RZ)
 #    define OS_CLOCK       32000000
 
 #elif defined(TARGET_STM32F401VC)