diff --git a/libraries/rtos/rtx/RTX_CM_lib.h b/libraries/rtos/rtx/RTX_CM_lib.h
index 6b7699fd48..40fd86e382 100644
--- a/libraries/rtos/rtx/RTX_CM_lib.h
+++ b/libraries/rtos/rtx/RTX_CM_lib.h
@@ -208,6 +208,9 @@ osThreadDef_t os_thread_def_main = {(os_pthread)main, osPriorityNormal, 0, NULL}
 #elif TARGET_LPC1114
 #define INITIAL_SP            (0x10001000UL)
 
+#elif TARGET_LPC812
+#define INITIAL_SP            (0x10001000UL)
+
 #elif TARGET_KL25Z
 #define INITIAL_SP            (0x20003000UL)
 
diff --git a/libraries/rtos/rtx/RTX_Conf_CM.c b/libraries/rtos/rtx/RTX_Conf_CM.c
index 1df4b9bc3f..7a8b9b2021 100644
--- a/libraries/rtos/rtx/RTX_Conf_CM.c
+++ b/libraries/rtos/rtx/RTX_Conf_CM.c
@@ -51,7 +51,7 @@
 #ifndef OS_TASKCNT
 #  if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) || defined(TARGET_LPC4088) || defined(TARGET_LPC1347)
 #    define OS_TASKCNT         14
-#  elif defined(TARGET_LPC11U24) || (TARGET_LPC1114) || defined(TARGET_KL25Z)
+#  elif defined(TARGET_LPC11U24) || (TARGET_LPC1114) || (TARGET_LPC812) || defined(TARGET_KL25Z)
 #    define OS_TASKCNT         6
 #  endif
 #endif
@@ -60,7 +60,7 @@
 #ifndef OS_SCHEDULERSTKSIZE
 #  if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) || defined(TARGET_LPC4088) || defined(TARGET_LPC1347)
 #      define OS_SCHEDULERSTKSIZE    256
-#  elif defined(TARGET_LPC11U24) || (TARGET_LPC1114) || defined(TARGET_KL25Z)
+#  elif defined(TARGET_LPC11U24) || (TARGET_LPC1114) || (TARGET_LPC812) || defined(TARGET_KL25Z)
 #      define OS_SCHEDULERSTKSIZE    128
 #  endif
 #endif
@@ -110,6 +110,9 @@
 #  elif defined(TARGET_LPC11U24) || (TARGET_LPC1114) || defined(TARGET_KL25Z)
 #    define OS_CLOCK       48000000
 #
+#  elif defined(TARGET_LPC812)
+#    define OS_CLOCK       36000000
+#
 #  elif defined(TARGET_LPC4088)
 #    define OS_CLOCK       120000000
 #  endif