diff --git a/libavcodec/dcadec.c b/libavcodec/dcadec.c
index d1612e2d3a..dec7e2879c 100644
--- a/libavcodec/dcadec.c
+++ b/libavcodec/dcadec.c
@@ -968,7 +968,13 @@ static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
                        "Invalid channel mode %d\n", am);
                 return AVERROR_INVALIDDATA;
             }
-            for (j = base_channel; j < FFMIN(s->prim_channels, FF_ARRAY_ELEMS(dca_default_coeffs[am])); j++) {
+            if (s->prim_channels > FF_ARRAY_ELEMS(dca_default_coeffs[0])) {
+                avpriv_request_sample(s->avctx, "Downmixing %d channels",
+                                      s->prim_channels);
+                return AVERROR_PATCHWELCOME;
+            }
+
+            for (j = base_channel; j < s->prim_channels; j++) {
                 s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];
                 s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];
             }