diff --git a/targets/TARGET_GigaDevice/TARGET_GD32F30X/TARGET_GD32F307VG/device/TOOLCHAIN_ARM_STD/gd32f307vg.sct b/targets/TARGET_GigaDevice/TARGET_GD32F30X/TARGET_GD32F307VG/device/TOOLCHAIN_ARM_STD/gd32f307vg.sct
index cc2d580..323352a 100644
--- a/targets/TARGET_GigaDevice/TARGET_GD32F30X/TARGET_GD32F307VG/device/TOOLCHAIN_ARM_STD/gd32f307vg.sct
+++ b/targets/TARGET_GigaDevice/TARGET_GD32F30X/TARGET_GD32F307VG/device/TOOLCHAIN_ARM_STD/gd32f307vg.sct
@@ -46,14 +46,14 @@
   }
 
   ; 84 vectors (16 core + 68 peripheral) * 4 bytes = 336 bytes to reserve (0x150)
-  RW_IRAM1 (MBED_RAM_START+VECTOR_SIZE) (MBED_RAM_SIZE-VECTOR_SIZE-Stack_Size)  {  ; RW data
+  RW_IRAM1 (MBED_RAM_START+VECTOR_SIZE) (MBED_RAM_SIZE-RAM_FIXED_SIZE)  {  ; RW data
    .ANY (+RW +ZI)
   }
 
-  ARM_LIB_HEAP  AlignExpr(+0, 16)  EMPTY  (MBED_RAM_SIZE-RAM_FIXED_SIZE+MBED_RAM1_START-AlignExpr(ImageLimit(RW_IRAM1), 16))  {
+  ARM_LIB_HEAP  AlignExpr(+0, 16)  EMPTY  (MBED_RAM_SIZE-RAM_FIXED_SIZE+MBED_RAM1_START-AlignExpr(ImageLimit(RW_IRAM1), 16))  { ; Heap region growing up
   }
 
-  ARM_LIB_STACK (MBED_RAM_START+MBED_RAM_SIZE) EMPTY -Stack_Size { ; stack
+  ARM_LIB_STACK (MBED_RAM_START+MBED_RAM_SIZE) EMPTY -Stack_Size { ; Stack region growing down
   }
 }
 
diff --git a/targets/TARGET_GigaDevice/TARGET_GD32F4XX/device/TOOLCHAIN_ARM_STD/gd32f450zi.sct b/targets/TARGET_GigaDevice/TARGET_GD32F4XX/device/TOOLCHAIN_ARM_STD/gd32f450zi.sct
index 13da3c6..378336d 100644
--- a/targets/TARGET_GigaDevice/TARGET_GD32F4XX/device/TOOLCHAIN_ARM_STD/gd32f450zi.sct
+++ b/targets/TARGET_GigaDevice/TARGET_GD32F4XX/device/TOOLCHAIN_ARM_STD/gd32f450zi.sct
@@ -46,11 +46,11 @@
   }
 
   ; 107 vectors (16 core + 91 peripheral) * 4 bytes = 428 bytes to reserve (0x1B0, 8-byte aligned)
-  RW_IRAM1 (MBED_RAM_START+VECTOR_SIZE) (MBED_RAM_SIZE-VECTOR_SIZE-Stack_Size)  {  ; RW data
+  RW_IRAM1 (MBED_RAM_START+VECTOR_SIZE) (MBED_RAM_SIZE-RAM_FIXED_SIZE)  {  ; RW data
    .ANY (+RW +ZI)
   }
 
-  ARM_LIB_HEAP  AlignExpr(+0, 16)  EMPTY  (MBED_RAM_SIZE-RAM_FIXED_SIZE+MBED_RAM1_START-AlignExpr(ImageLimit(RW_IRAM1), 16))  {
+  ARM_LIB_HEAP  AlignExpr(+0, 16)  EMPTY  (MBED_RAM_SIZE-RAM_FIXED_SIZE+MBED_RAM1_START-AlignExpr(ImageLimit(RW_IRAM1), 16))  { ; Heap region growing up
   }
 
   ARM_LIB_STACK MBED_RAM_START+MBED_RAM_SIZE EMPTY -Stack_Size { ; Stack region growing down