diff --git a/libavcodec/g723_1dec.c b/libavcodec/g723_1dec.c
index ab952ec66d..f92eb76ba0 100644
--- a/libavcodec/g723_1dec.c
+++ b/libavcodec/g723_1dec.c
@@ -668,6 +668,8 @@ static int estimate_sid_gain(G723_1_Context *p)
             else                 t = INT32_MAX;
         } else
             t = p->sid_gain << shift;
+    } else if(shift < -31) {
+        t = (p->sid_gain < 0) ? -1 : 0;
     }else
         t = p->sid_gain >> -shift;
     x = av_clipl_int32(t * (int64_t)cng_filt[0] >> 16);