diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 4d2146f23a..e670aa94ed 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -648,12 +648,12 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
                     *dst++ = buf[0][i] | (buf[1][i] << 4);
             }
         } else
-        for (n *= avctx->channels; n>0; n--) {
-            int nibble;
-            nibble  = adpcm_yamaha_compress_sample(&c->status[ 0], *samples++);
-            nibble |= adpcm_yamaha_compress_sample(&c->status[st], *samples++) << 4;
-            *dst++ = nibble;
-        }
+            for (n *= avctx->channels; n>0; n--) {
+                int nibble;
+                nibble  = adpcm_yamaha_compress_sample(&c->status[ 0], *samples++);
+                nibble |= adpcm_yamaha_compress_sample(&c->status[st], *samples++) << 4;
+                *dst++ = nibble;
+            }
         break;
     default:
         return -1;