diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 577d0aa260..7893bc320f 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -905,6 +905,9 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift,
     int i, j;
     int32_t dotprod, sign;
 
+    if (order >= length)
+        return;
+
     memset(coeffs, 0, order * sizeof(*coeffs));
     for (i = 0; i < order; i++)
         delay[i] = buffer[i];