diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index c40430120b..580f47571c 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -666,7 +666,7 @@ static int cbs_h26 ## h26n ## _replace_ ## ps_var(CodedBitstreamContext *ctx, \
 { \
     CodedBitstreamH26 ## h26n ## Context *priv = ctx->priv_data; \
     unsigned int id = ps_var->id_element; \
-    if (id > FF_ARRAY_ELEMS(priv->ps_var)) { \
+    if (id >= FF_ARRAY_ELEMS(priv->ps_var)) { \
         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid " #ps_name \
                " id : %d.\n", id); \
         return AVERROR_INVALIDDATA; \