diff --git a/http2-tests/src/test/resources/application.conf b/http2-tests/src/test/resources/application.conf
new file mode 100644
index 000000000..1a2da3d0b
--- /dev/null
+++ b/http2-tests/src/test/resources/application.conf
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+
+pekko {
+  # TLS engine to use for tests, default is "legacy-actor" but can be overridden by setting
+  # the system property or environment variable TLS_ENGINE_CONFIG to "graph-stage"
+  # see https://github.com/apache/pekko/pull/2878
+  stream.materializer.tls.engine = "legacy-actor"
+  stream.materializer.tls.engine = ${?TLS_ENGINE_CONFIG}
+}