diff --git a/kernel/syscall/syscall.c b/kernel/syscall/syscall.c
index e2d5405..b73d278 100644
--- a/kernel/syscall/syscall.c
+++ b/kernel/syscall/syscall.c
@@ -26,7 +26,8 @@ static syscall_handler_func_t handler_table[] = {
 };
 
 syscall_handler_func_t syscall_find_handler (int syscall_num) {
-  if (!(syscall_num >= 0 && syscall_num < (sizeof (handler_table) / sizeof (handler_table[0])))) {
+  if (!(syscall_num >= 0 &&
+        syscall_num < (int)(sizeof (handler_table) / sizeof (handler_table[0])))) {
     return NULL;
   }