diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index bac703c101..c8c8920ed0 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1379,7 +1379,7 @@ static int AC3_encode_frame(AVCodecContext *avctx,
             v = 14 - log2_tab(input_samples, N);
             if (v < 0)
                 v = 0;
-            exp_samples[i][ch] = v - 9;
+            exp_samples[i][ch] = v - 10;
             lshift_tab(input_samples, N, v);
 
             /* do the MDCT */
diff --git a/tests/ffmpeg.regression.ref b/tests/ffmpeg.regression.ref
index d4200c5750..6f53c41eed 100644
--- a/tests/ffmpeg.regression.ref
+++ b/tests/ffmpeg.regression.ref
@@ -158,7 +158,7 @@ stddev: 10.99 PSNR:27.30 bytes:7602176
 83f8df5d5f84480566af548bb037fceb *./data/out.wav
 stddev:9330.70 PSNR:16.92 bytes:1054720
 stddev:4396.13 PSNR:23.46 bytes:1052672
-aefe11ab5067621a1c674859d6413891 *./data/a-ac3.rm
+dd68110cb7e5388392f89d5160d3a825 *./data/a-ac3.rm
 98203 ./data/a-ac3.rm
 9e6e66847a568ef4f1f229b0939d2aae *./data/a-g726.wav
 24268 ./data/a-g726.wav
diff --git a/tests/libav.regression.ref b/tests/libav.regression.ref
index 3184d8626f..63d655d761 100644
--- a/tests/libav.regression.ref
+++ b/tests/libav.regression.ref
@@ -5,7 +5,7 @@ ffmpeg regression test
 bac6c5f50f3ca5db6e2ef6eaccf1d4f1 *./data/b-libav.asf
 342967 ./data/b-libav.asf
 ./data/b-libav.asf CRC=0x94d219de
-5275686385346789108ec4fdf06ecef8 *./data/b-libav.rm
+3f63f396a3e9f08cdb5c30b4ef3a2436 *./data/b-libav.rm
 360269 ./data/b-libav.rm
 90784a1b9589095f20fc6bcc0cc23cc4 *./data/b-libav.mpg
 387072 ./data/b-libav.mpg
diff --git a/tests/rotozoom.regression.ref b/tests/rotozoom.regression.ref
index 8554c5f6a7..fb006c8c3b 100644
--- a/tests/rotozoom.regression.ref
+++ b/tests/rotozoom.regression.ref
@@ -158,7 +158,7 @@ stddev:  3.44 PSNR:37.38 bytes:7602176
 83f8df5d5f84480566af548bb037fceb *./data/out.wav
 stddev:9330.70 PSNR:16.92 bytes:1054720
 stddev:4396.13 PSNR:23.46 bytes:1052672
-aefe11ab5067621a1c674859d6413891 *./data/a-ac3.rm
+dd68110cb7e5388392f89d5160d3a825 *./data/a-ac3.rm
 98203 ./data/a-ac3.rm
 9e6e66847a568ef4f1f229b0939d2aae *./data/a-g726.wav
 24268 ./data/a-g726.wav