diff --git a/include/mem_map.h b/include/mem_map.h
index 0d5cabf..f9f35b8 100644
--- a/include/mem_map.h
+++ b/include/mem_map.h
@@ -107,7 +107,9 @@
 #define	A9_STUB_SIZE         (0x200)
 #define A9_HEAP_END          (A9_RAM_BASE + A9_RAM_SIZE)
 #define A9_STACK_START       (DTCM_BASE)
-#define A9_STACK_END         (DTCM_BASE + DTCM_SIZE)
+#define A9_STACK_END         (DTCM_BASE + DTCM_SIZE - 0x1000)
+#define A9_IRQ_STACK_START   (DTCM_BASE + DTCM_SIZE - 0x1000)
+#define A9_IRQ_STACK_END     (DTCM_BASE + DTCM_SIZE)
 #define A9_EXC_STACK_START   (ITCM_KERNEL_MIRROR + (ITCM_SIZE / 2))
 #define A9_EXC_STACK_END     (ITCM_KERNEL_MIRROR + ITCM_SIZE)
 #define FIRM_LOAD_ADDR       (VRAM_BASE + 0x200000)
diff --git a/source/arm9/start.s b/source/arm9/start.s
index 8212c4f..7df50f4 100644
--- a/source/arm9/start.s
+++ b/source/arm9/start.s
@@ -60,7 +60,7 @@
 
 	mov sp, #0                  @ SVC mode sp (Unused, aborts)
 	msr cpsr_cxsf, #0xD2        @ IRQ mode
-	ldr sp, =(A9_STACK_END - 0x2000)
+	ldr sp, =A9_IRQ_STACK_END
 	msr cpsr_cxsf, #0xDF        @ System mode
 	ldr sp, =A9_STACK_END