diff --git a/include/haproxy/hlua-t.h b/include/haproxy/hlua-t.h
index ed2cfad75..9716868f8 100644
--- a/include/haproxy/hlua-t.h
+++ b/include/haproxy/hlua-t.h
@@ -72,8 +72,8 @@ struct stream;
 #define HLUA_NOYIELD   0x00000020
 #define HLUA_BUSY      0x00000040
 
-#define HLUA_F_AS_STRING    0x01
-#define HLUA_F_MAY_USE_HTTP 0x02
+#define HLUA_F_AS_STRING             0x01
+#define HLUA_F_MAY_USE_CHANNELS_DATA 0x02
 
 /* HLUA TXN flags */
 #define HLUA_TXN_NOTERM   0x00000001
diff --git a/src/hlua.c b/src/hlua.c
index d4734e0af..48acc0b79 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -4907,10 +4907,10 @@ __LJMP static int hlua_run_sample_fetch(lua_State *L)
 	hsmp = MAY_LJMP(hlua_checkfetches(L, 1));
 
 	/* Check execution authorization. */
-	if (f->use & SMP_USE_HTTP_ANY &&
-	    !(hsmp->flags & HLUA_F_MAY_USE_HTTP)) {
-		lua_pushfstring(L, "the sample-fetch '%s' needs an HTTP parser which "
-		                   "is not available in Lua services", f->kw);
+	if ((f->use & (SMP_USE_L6REQ|SMP_USE_L6RES|SMP_USE_HTTP_ANY)) &&
+	    !(hsmp->flags & HLUA_F_MAY_USE_CHANNELS_DATA)) {
+		lua_pushfstring(L, "the sample-fetch '%s' needs to access data from channel's buffer which"
+				" is not available in Lua services", f->kw);
 		WILL_LJMP(lua_error(L));
 	}
 
@@ -8588,13 +8588,13 @@ __LJMP static int hlua_txn_new(lua_State *L, struct stream *s, struct proxy *p,
 
 	/* Create the "f" field that contains a list of fetches. */
 	lua_pushstring(L, "f");
-	if (!hlua_fetches_new(L, htxn, HLUA_F_MAY_USE_HTTP))
+	if (!hlua_fetches_new(L, htxn, HLUA_F_MAY_USE_CHANNELS_DATA))
 		return 0;
 	lua_rawset(L, -3);
 
 	/* Create the "sf" field that contains a list of stringsafe fetches. */
 	lua_pushstring(L, "sf");
-	if (!hlua_fetches_new(L, htxn, HLUA_F_MAY_USE_HTTP | HLUA_F_AS_STRING))
+	if (!hlua_fetches_new(L, htxn, HLUA_F_MAY_USE_CHANNELS_DATA | HLUA_F_AS_STRING))
 		return 0;
 	lua_rawset(L, -3);