diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 15d038a5b6..274e76be9d 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -524,6 +524,8 @@ static av_cold void exponent_init(AC3EncodeContext *s)
         exponent_group_tab[1][i] = (i + 2) /  6;
         exponent_group_tab[2][i] = (i + 8) / 12;
     }
+    /* LFE */
+    exponent_group_tab[0][7] = 2;
 }