diff --git a/lib/SyTest/Homeserver/Dendrite.pm b/lib/SyTest/Homeserver/Dendrite.pm
index 37cd57622..60313b469 100644
--- a/lib/SyTest/Homeserver/Dendrite.pm
+++ b/lib/SyTest/Homeserver/Dendrite.pm
@@ -286,6 +286,8 @@ sub _start_monolith
       setup => [
          env => {
             LOG_DIR => $self->{hs_dir},
+            DENDRITE_TRACE_SQL => $ENV{'DENDRITE_TRACE_SQL'},
+            DENDRITE_TRACE_HTTP => $ENV{'DENDRITE_TRACE_HTTP'},
          },
       ],
       command => [ @command ],