diff --git a/TESTS/mbedmicro-rtos-mbed/basic/main.cpp b/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
index c547a9255b..4fcad940e8 100644
--- a/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/basic/main.cpp
@@ -17,6 +17,14 @@
 #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 39d20562a9..438ea20972 100644
--- a/TESTS/mbedmicro-rtos-mbed/isr/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/isr/main.cpp
@@ -20,6 +20,14 @@
     #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 f8c356346f..a4ec5d847c 100644
--- a/TESTS/mbedmicro-rtos-mbed/mail/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/mail/main.cpp
@@ -28,6 +28,14 @@ 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 3dbb3ffe13..81e9768463 100644
--- a/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/mutex/main.cpp
@@ -30,6 +30,14 @@
     #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 450644de6e..dab4c85804 100644
--- a/TESTS/mbedmicro-rtos-mbed/queue/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/queue/main.cpp
@@ -28,6 +28,14 @@ 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 5e06a22c22..f8a1e52bbe 100644
--- a/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/semaphore/main.cpp
@@ -33,6 +33,14 @@
     #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 344aa0bb9a..d80bd72be9 100644
--- a/TESTS/mbedmicro-rtos-mbed/signals/main.cpp
+++ b/TESTS/mbedmicro-rtos-mbed/signals/main.cpp
@@ -19,6 +19,14 @@ 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