diff --git a/kernel/common/printk.c b/kernel/common/printk.c
index 462ad13c..a187e1fb 100644
--- a/kernel/common/printk.c
+++ b/kernel/common/printk.c
@@ -405,7 +405,7 @@ static int vsprintf(char *buf, const char *fmt, va_list args)
     return str - buf;
 }
 
-static char *write_num(char *str, ull num, int base, int field_width, int precision, int flags)
+static char *write_num(char *str, ll num, int base, int field_width, int precision, int flags)
 {
     /**
      * @brief 将数字按照指定的要求转换成对应的字符串
diff --git a/kernel/common/printk.h b/kernel/common/printk.h
index 6be27041..ef9b25d8 100644
--- a/kernel/common/printk.h
+++ b/kernel/common/printk.h
@@ -88,7 +88,7 @@ static int vsprintf(char *buf, const char *fmt, va_list args);
  * @param precision 精度
  * @param flags 标志位
  */
-static char *write_num(char *str, ull num, int base, int field_width, int precision, int flags);
+static char *write_num(char *str, ll num, int base, int field_width, int precision, int flags);
 
 static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags);