diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index cb94b3cca6..e317b33b1f 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -416,8 +416,8 @@ static int old_codec37(SANMVideoContext *ctx, int top,
     flags        = bytestream2_get_byte(&ctx->gb);
     bytestream2_skip(&ctx->gb, 3);
 
-    if (decoded_size > height * stride - left - top * stride) {
-        decoded_size = height * stride - left - top * stride;
+    if (decoded_size > ctx->height * stride - left - top * stride) {
+        decoded_size = ctx->height * stride - left - top * stride;
         av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
     }
 
@@ -644,8 +644,8 @@ static int old_codec47(SANMVideoContext *ctx, int top,
     decoded_size = bytestream2_get_le32(&ctx->gb);
     bytestream2_skip(&ctx->gb, 8);
 
-    if (decoded_size > height * stride - left - top * stride) {
-        decoded_size = height * stride - left - top * stride;
+    if (decoded_size > ctx->height * stride - left - top * stride) {
+        decoded_size = ctx->height * stride - left - top * stride;
         av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
     }