diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 920cb7d1e9..082019b802 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -269,7 +269,8 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
     return 0;
 }
 
-static const int fixed_coeffs[3][3] = {
+static const int fixed_coeffs[][3] = {
+    { 0,  0,  0 },
     { 1,  0,  0 },
     { 2, -1,  0 },
     { 3, -3,  1 }
@@ -298,7 +299,12 @@ static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
     } else {
         /* fixed LPC coeffs */
         pred_order = command;
-        coeffs     = fixed_coeffs[pred_order - 1];
+        if (pred_order > FF_ARRAY_ELEMS(fixed_coeffs)) {
+            av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
+                   pred_order);
+            return AVERROR_INVALIDDATA;
+        }
+        coeffs     = fixed_coeffs[pred_order];
         qshift     = 0;
     }