diff --git a/TESTS/mbedmicro-rtos-mbed/basic/main.cpp b/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
index c98d4c9a642..ee61cbc4efd 100644
--- a/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
@@ -13,6 +13,14 @@
 #define STACK_SIZE DEFAULT_STACK_SIZE/2
 #elif (defined(TARGET_STM32F030R8)) && defined(TOOLCHAIN_IAR)
 #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+#define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+#define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+#define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+#define STACK_SIZE 512
 #else
 #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/isr/main.cpp b/TESTS/mbedmicro-rtos-mbed/isr/main.cpp
index ec16a4ea7ab..34ef68aef35 100644
--- a/TESTS/mbedmicro-rtos-mbed/isr/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/isr/main.cpp
@@ -16,6 +16,14 @@
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
 #elif (defined(TARGET_STM32F030R8)) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/mail/main.cpp b/TESTS/mbedmicro-rtos-mbed/mail/main.cpp
index 60e51174107..494ae191ccc 100644
--- a/TESTS/mbedmicro-rtos-mbed/mail/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/mail/main.cpp
@@ -24,6 +24,14 @@ typedef struct {
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
 #elif (defined(TARGET_STM32F030R8)) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp b/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp
index bbd29dec2e5..86cadb575fb 100644
--- a/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp
@@ -26,6 +26,14 @@
     #define STACK_SIZE DEFAULT_STACK_SIZE/2		
 #elif defined(TARGET_STM32F303K8) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/queue/main.cpp b/TESTS/mbedmicro-rtos-mbed/queue/main.cpp
index 98dd5e13f6f..a2f9c8ef35c 100644
--- a/TESTS/mbedmicro-rtos-mbed/queue/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/queue/main.cpp
@@ -24,6 +24,14 @@ typedef struct {
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
 #elif (defined(TARGET_STM32F030R8)) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp b/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp
index 2024a0286ef..b36c4b7d484 100644
--- a/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp
@@ -29,6 +29,14 @@
     #define STACK_SIZE DEFAULT_STACK_SIZE/2		
 #elif defined(TARGET_STM32F303K8) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif
diff --git a/TESTS/mbedmicro-rtos-mbed/signals/main.cpp b/TESTS/mbedmicro-rtos-mbed/signals/main.cpp
index 866b67d0eb6..11cd3ff170b 100644
--- a/TESTS/mbedmicro-rtos-mbed/signals/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/signals/main.cpp
@@ -15,6 +15,14 @@ const int SIGNAL_HANDLE_DELEY = 25;
     #define STACK_SIZE DEFAULT_STACK_SIZE/4
 #elif (defined(TARGET_STM32F030R8)) && defined(TOOLCHAIN_IAR)
     #define STACK_SIZE DEFAULT_STACK_SIZE/2
+#elif (defined(TARGET_EFM32HG_STK3400)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 512
+#elif (defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32WG_STK3800) || defined(TARGET_EFM32PG_STK3401)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 768
+#elif (defined(TARGET_EFM32GG_STK3700)) && !defined(TOOLCHAIN_ARM_MICRO)
+    #define STACK_SIZE 1536
+#elif defined(TARGET_MCU_NRF51822)
+    #define STACK_SIZE 512
 #else
     #define STACK_SIZE DEFAULT_STACK_SIZE
 #endif