diff --git a/src/filters.c b/src/filters.c
index aeaf81e..2d2049d 100644
--- a/src/filters.c
+++ b/src/filters.c
@@ -473,6 +473,8 @@
 		if (FLT_OPS(filter)->stream_start && FLT_OPS(filter)->stream_start(s, filter) < 0)
 			return -1;
 	}
+	if (strm_li(s) && (strm_li(s)->analysers & AN_REQ_FLT_START_FE))
+		s->req.flags |= CF_FLT_ANALYZE;
 	return 0;
 }
 
@@ -531,6 +533,10 @@
 		    FLT_OPS(filter)->stream_set_backend(s, filter, be) < 0)
 			return -1;
 	}
+	if (be->be_req_ana & AN_REQ_FLT_START_BE)
+		s->req.flags |= CF_FLT_ANALYZE;
+	if ((strm_fe(s)->fe_rsp_ana | be->be_rsp_ana) & (AN_RES_FLT_START_FE|AN_RES_FLT_START_BE))
+		s->res.flags |= CF_FLT_ANALYZE;
 
 	return 0;
 }