diff --git a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/startup_stm32f401xe.s b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/startup_stm32f401xe.s
index 05eec69385..caa62ac714 100644
--- a/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/startup_stm32f401xe.s
+++ b/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F401RE/TOOLCHAIN_ARM_STD/startup_stm32f401xe.s
@@ -39,30 +39,9 @@
 ; 
 ;*******************************************************************************
 
-Stack_Size      EQU     0x00000400
 
-                AREA    STACK, NOINIT, READWRITE, ALIGN=3
-                EXPORT  __initial_sp
-
-Stack_Mem       SPACE   Stack_Size
 __initial_sp    EQU     0x20018000 ; Top of RAM
 
-
-; <h> Heap Configuration
-;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
-; </h>
-
-Heap_Size       EQU     0x00000400
-
-                AREA    HEAP, NOINIT, READWRITE, ALIGN=3
-                EXPORT  __heap_base
-                EXPORT  __heap_limit
-
-__heap_base
-Heap_Mem        SPACE   Heap_Size
-__heap_limit
-
-  
                 PRESERVE8
                 THUMB