diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index de05a8b300..46accde81e 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -106,6 +106,7 @@
 
 #define WMAPRO_BLOCK_MIN_BITS  6                                           ///< log2 of min block size
 #define WMAPRO_BLOCK_MAX_BITS 13                                           ///< log2 of max block size
+#define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS)                 ///< minimum block size
 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)                 ///< maximum block size
 #define WMAPRO_BLOCK_SIZES    (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
 
@@ -336,7 +337,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
-    if (s->min_samples_per_subframe < (1<<WMAPRO_BLOCK_MIN_BITS)) {
+    if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
         av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
                s->min_samples_per_subframe);
         return AVERROR_INVALIDDATA;