diff --git a/targets/TARGET_NXP/TARGET_LPC408X/device/TOOLCHAIN_IAR/LPC4088.icf b/targets/TARGET_NXP/TARGET_LPC408X/device/TOOLCHAIN_IAR/LPC4088.icf
index 97484feaaf..53324c750d 100644
--- a/targets/TARGET_NXP/TARGET_LPC408X/device/TOOLCHAIN_IAR/LPC4088.icf
+++ b/targets/TARGET_NXP/TARGET_LPC408X/device/TOOLCHAIN_IAR/LPC4088.icf
@@ -11,8 +11,8 @@ define symbol __ICFEDIT_region_NVIC_end__   = 0x100000E7;
 define symbol __ICFEDIT_region_RAM_start__   = 0x100000E8;
 define symbol __ICFEDIT_region_RAM_end__     = 0x1000FFDF;
 /*-Sizes-*/
-/*Heap 1/4 of ram and stack 1/8*/
-define symbol __ICFEDIT_size_cstack__   = 0x2000;
+/*Heap 1/4 of ram and stack 1/64*/
+define symbol __ICFEDIT_size_cstack__   = 0x400;
 define symbol __ICFEDIT_size_heap__     = 0x4000;
 /**** End of ICF editor section. ###ICF###*/