diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c
index 4c764a8f01..6f46fe3c8a 100644
--- a/libavcodec/wmavoice.c
+++ b/libavcodec/wmavoice.c
@@ -382,7 +382,7 @@ static av_cold int wmavoice_decode_init(AVCodecContext *ctx)
                ctx->extradata_size);
         return AVERROR_INVALIDDATA;
     }
-    if (ctx->block_align <= 0) {
+    if (ctx->block_align <= 0 || ctx->block_align > (1<<22)) {
         av_log(ctx, AV_LOG_ERROR, "Invalid block alignment %d.\n", ctx->block_align);
         return AVERROR_INVALIDDATA;
     }