diff --git a/libavcodec/sipr.c b/libavcodec/sipr.c
index c9fccb2d3a..f57ec4fd2a 100644
--- a/libavcodec/sipr.c
+++ b/libavcodec/sipr.c
@@ -509,7 +509,7 @@ static int sipr_decode_frame(AVCodecContext *avctx, void *datap,
     GetBitContext gb;
     float *data = datap;
     int subframe_size = ctx->mode == MODE_16k ? L_SUBFR_16k : SUBFR_SIZE;
-    int i;
+    int i, out_size;
 
     ctx->avctx = avctx;
     if (avpkt->size < (mode_par->bits_per_frame >> 3)) {
@@ -520,7 +520,11 @@ static int sipr_decode_frame(AVCodecContext *avctx, void *datap,
         *data_size = 0;
         return -1;
     }
-    if (*data_size < subframe_size * mode_par->subframe_count * sizeof(float)) {
+
+    out_size = mode_par->frames_per_packet * subframe_size *
+               mode_par->subframe_count *
+               av_get_bytes_per_sample(avctx->sample_fmt);
+    if (*data_size < out_size) {
         av_log(avctx, AV_LOG_ERROR,
                "Error processing packet: output buffer (%d) too small\n",
                *data_size);
@@ -542,8 +546,7 @@ static int sipr_decode_frame(AVCodecContext *avctx, void *datap,
         data += subframe_size * mode_par->subframe_count;
     }
 
-    *data_size = mode_par->frames_per_packet * subframe_size *
-        mode_par->subframe_count * sizeof(float);
+    *data_size = out_size;
 
     return mode_par->bits_per_frame >> 3;
 }