diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 91b82cfa7d..650468bfd6 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -613,7 +613,7 @@ static void do_rematrixing(AC3DecodeContext *s)
             bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd+1]);
             for(; i<bndend; i++) {
                 int tmp0 = s->fixed_coeffs[1][i];
-                s->fixed_coeffs[1][i] -= s->fixed_coeffs[2][i];
+                s->fixed_coeffs[1][i] += s->fixed_coeffs[2][i];
                 s->fixed_coeffs[2][i]  = tmp0 - s->fixed_coeffs[2][i];
             }
         }