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 5ed9204f36..178aa0f603 100755
--- a/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
+++ b/libraries/rtos/rtx/TARGET_CORTEX_M/RTX_Conf_CM.c
@@ -116,7 +116,7 @@
 #  if defined(TARGET_LPC1768) || defined(TARGET_LPC2368)
 #    define OS_CLOCK       96000000
 
-#  elif defined(TARGET_LPC1347) || defined(TARGET_STM32F303VC) || defined(TARGET_LPC1549) || defined(TARGET_STM32F302R8) || defined(TARGET_STM32F334R8) || defined(TARGET_STM32F334C8)
+#  elif defined(TARGET_LPC1347) || defined(TARGET_STM32F303VC) || defined(TARGET_LPC1549) || defined(TARGET_STM32F334R8) || defined(TARGET_STM32F334C8)
 #    define OS_CLOCK       72000000
 
 #  elif defined(TARGET_LPC11U24) || defined(TARGET_LPC11U35_401)  || defined(TARGET_LPC11U35_501) || defined(TARGET_LPCCAPPUCCINO)  || defined(TARGET_LPC1114) || defined(TARGET_KL25Z) || defined(TARGET_KL05Z) || defined(TARGET_KL46Z) || defined(TARGET_KL43Z) || defined(TARGET_STM32F051R8) || defined(TARGET_LPC11U68)
@@ -155,6 +155,9 @@
 #elif defined(TARGET_STM32F429ZI)
 #    define OS_CLOCK       168000000
 
+#elif defined(TARGET_STM32F302R8)
+#    define OS_CLOCK       64000000
+
 #  else
 #    error "no target defined"
 #  endif