1 files changed, 2 insertions, 2 deletions

diff --git a/src/lj_buf.c b/src/lj_buf.c
index c8778016..935ae488 100644
--- a/src/lj_buf.c
+++ b/src/lj_buf.c
@@ -30,7 +30,7 @@ static void buf_grow(SBuf *sb, MSize sz)
 
 LJ_NOINLINE char *LJ_FASTCALL lj_buf_need2(SBuf *sb, MSize sz)
 {
-  lua_assert(sz > sbufsz(sb));
+  lj_assertG_(G(sbufL(sb)), sz > sbufsz(sb), "SBuf overflow");
   if (LJ_UNLIKELY(sz > LJ_MAX_BUF))
     lj_err_mem(sbufL(sb));
   buf_grow(sb, sz);
@@ -40,7 +40,7 @@ LJ_NOINLINE char *LJ_FASTCALL lj_buf_need2(SBuf *sb, MSize sz)
 LJ_NOINLINE char *LJ_FASTCALL lj_buf_more2(SBuf *sb, MSize sz)
 {
   MSize len = sbuflen(sb);
-  lua_assert(sz > sbufleft(sb));
+  lj_assertG_(G(sbufL(sb)), sz > sbufleft(sb), "SBuf overflow");
   if (LJ_UNLIKELY(sz > LJ_MAX_BUF || len + sz > LJ_MAX_BUF))
     lj_err_mem(sbufL(sb));
   buf_grow(sb, len + sz);