diff --git a/src/backend.c b/src/backend.c
index fc00666..88991a8 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -347,7 +347,7 @@
 
 		p = params = NULL;
 		len = 0;
-		for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
+		for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
 			enum htx_blk_type type = htx_get_blk_type(blk);
 			struct ist v;