1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib_string.c b/src/lib_string.c
index a02038e9..9ec6d0c3 100644
--- a/src/lib_string.c
+++ b/src/lib_string.c
@@ -64,7 +64,7 @@ LJLIB_ASM(string_byte)		LJLIB_REC(string_range 0)
 LJLIB_ASM(string_char)
 {
   int i, nargs = (int)(L->top - L->base);
-  char *buf = lj_str_needbuf(L, &G(L)->tmpbuf, (size_t)nargs);
+  char *buf = lj_str_needbuf(L, &G(L)->tmpbuf, (MSize)nargs);
   for (i = 1; i <= nargs; i++) {
     int32_t k = lj_lib_checkint(L, i);
     if (!checku8(k))