diff --git a/src/proto_http.c b/src/proto_http.c
index e7d84ce95..311268f1b 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -8673,7 +8673,7 @@ smp_fetch_hdr(struct proxy *px, struct session *l4, void *l7, unsigned int opt,
 		/* first call */
 		ctx = &static_hdr_ctx;
 		ctx->idx = 0;
-		smp->ctx.a[2] = ctx;
+		smp->ctx.a[0] = ctx;
 	}
 
 	if (args) {