diff --git a/hal/tests/TESTS/mbed_hal/stack_size_unification/main.cpp b/hal/tests/TESTS/mbed_hal/stack_size_unification/main.cpp
index 6074023..c430137 100644
--- a/hal/tests/TESTS/mbed_hal/stack_size_unification/main.cpp
+++ b/hal/tests/TESTS/mbed_hal/stack_size_unification/main.cpp
@@ -38,7 +38,7 @@
 #define EXPECTED_USER_THREAD_DEFAULT_STACK_SIZE  (MBED_CONF_RTOS_THREAD_STACK_SIZE)
 
 #if ((MBED_RAM_SIZE - MBED_CONF_TARGET_BOOT_STACK_SIZE) <= (EXPECTED_MAIN_THREAD_STACK_SIZE + EXPECTED_ISR_STACK_SIZE))
-#error [NOT_SUPPORTED] Insufficient stack for staci_size_unification tests
+#error [NOT_SUPPORTED] Insufficient stack for stack_size_unification tests
 #endif
 
 
diff --git a/targets/TARGET_ARM_SSG/TARGET_MUSCA_S1/device/cmsis_nvic.h b/targets/TARGET_ARM_SSG/TARGET_MUSCA_S1/device/cmsis_nvic.h
index b83a445..7836e2b 100644
--- a/targets/TARGET_ARM_SSG/TARGET_MUSCA_S1/device/cmsis_nvic.h
+++ b/targets/TARGET_ARM_SSG/TARGET_MUSCA_S1/device/cmsis_nvic.h
@@ -31,5 +31,6 @@
 #define NVIC_RAM_VECTOR_ADDRESS NS_DATA_START
 #define NVIC_RAM_VECTOR_SIZE    (NVIC_NUM_VECTORS * 4)
 #define NVIC_RAM_VECTOR_LIMIT   (NVIC_RAM_VECTOR_ADDRESS + NVIC_RAM_VECTOR_SIZE)
+#define MBED_RAM_SIZE NS_DATA_SIZE
 
 #endif