diff --git a/components/libc/compilers/common/ctime.c b/components/libc/compilers/common/ctime.c
index 80f1c27..4e4f8e8 100644
--- a/components/libc/compilers/common/ctime.c
+++ b/components/libc/compilers/common/ctime.c
@@ -65,8 +65,8 @@ static const short __spm[13] =
     (31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
 };
 
-rt_align(4) static const char *days = "Sun Mon Tue Wed Thu Fri Sat ";
-rt_align(4) static const char *months = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
+rt_align(RT_ALIGN_SIZE) static const char *days = "Sun Mon Tue Wed Thu Fri Sat ";
+rt_align(RT_ALIGN_SIZE) static const char *months = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
 
 static int __isleap(int year)
 {