diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index ef028cd60..2f8be3f5e 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -30,7 +30,6 @@
 #include <proto/stream.h>
 
 #define IS_HTX_STRM(strm) ((strm)->flags & SF_HTX)
-#define IS_HTX_SMP(smp)   ((smp)->strm && IS_HTX_STRM((smp)->strm))
 
 extern struct pool_head *pool_head_uniqueid;
 
diff --git a/src/payload.c b/src/payload.c
index a16f8c601..f9b5fe02a 100644
--- a/src/payload.c
+++ b/src/payload.c
@@ -55,7 +55,7 @@ smp_fetch_len(const struct arg *args, struct sample *smp, const char *kw, void *
 
 	chn = ((smp->opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? &smp->strm->res : &smp->strm->req;
 	smp->data.type = SMP_T_SINT;
-	if (IS_HTX_SMP(smp)) {
+	if (IS_HTX_STRM(smp->strm)) {
 		struct htx *htx = htxbuf(&chn->buf);
 		smp->data.u.sint = htx->data - co_data(chn);
 	}