diff --git a/package/STM32F103RCBooter/startup_stm32f103xe.s b/package/STM32F103RCBooter/startup_stm32f103xe.s
index f4f58d07d..7658010cf 100644
--- a/package/STM32F103RCBooter/startup_stm32f103xe.s
+++ b/package/STM32F103RCBooter/startup_stm32f103xe.s
@@ -30,7 +30,7 @@
 ;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
 ; </h>
 
-Stack_Size		EQU     0x4000
+Stack_Size		EQU     0x1000
 
                 AREA    STACK, NOINIT, READWRITE, ALIGN=3
 Stack_Mem       SPACE   Stack_Size
@@ -40,7 +40,7 @@ __initial_sp
 ;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
 ; </h>
 
-Heap_Size      EQU     0x400
+Heap_Size      EQU     0x4000
 
                 AREA    HEAP, NOINIT, READWRITE, ALIGN=3
 __heap_base