diff --git a/arch/arm/src/common/up_initialize.c b/arch/arm/src/common/up_initialize.c
index 5182598246a..aeee1aaf503 100644
--- a/arch/arm/src/common/up_initialize.c
+++ b/arch/arm/src/common/up_initialize.c
@@ -106,7 +106,7 @@ static inline void up_color_intstack(void)
   uint32_t *ptr = (uint32_t *)&g_intstackalloc;
   ssize_t size;
 
-  for (size = (CONFIG_ARCH_INTERRUPTSTACK & ~3);
+  for (size = (CONFIG_ARCH_INTERRUPTSTACK & ~7);
        size > 0;
        size -= sizeof(uint32_t))
     {