diff --git a/reg-tests/http-rules/http_return.vtc b/reg-tests/http-rules/http_return.vtc
index a50f1fe..8189028 100644
--- a/reg-tests/http-rules/http_return.vtc
+++ b/reg-tests/http-rules/http_return.vtc
@@ -6,6 +6,12 @@
 feature ignore_unknown_macro
 
 haproxy h1 -conf {
+    global
+        # WT: limit false-positives causing "HTTP header incomplete" due to
+        # idle server connections being randomly used and randomly expiring
+        # under us.
+        tune.idle-pool.shared off
+
     defaults
         mode http
         timeout connect 1s