diff --git a/arch/mn10300/kernel/setup.c b/arch/mn10300/kernel/setup.c
index 017121ce896f..e1d88ab51008 100644
--- a/arch/mn10300/kernel/setup.c
+++ b/arch/mn10300/kernel/setup.c
@@ -161,7 +161,7 @@ void __init setup_arch(char **cmdline_p)
 	   reserve the page it is occupying. */
 	if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 	    CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
-		reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, 1,
+		reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 				BOOTMEM_DEFAULT);
 
 	reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,