diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
index 0d7920d..db0e96c 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
@@ -50,7 +50,7 @@
   RW_IRAM1 MBED_RAM1_START MBED_RAM1_SIZE {
    .ANY (+RW +ZI)
   }
-  ARM_LIB_HEAP AlignExpr(+0, 16) EMPTY (MBED_RAM_SIZE - RAM_FIXED_SIZE + MBED_RAM_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)) {
   }
   ARM_LIB_STACK MBED_RAM1_START + MBED_RAM1_SIZE EMPTY - Stack_Size { ; Stack region growing down
   }