diff --git a/settings.json.docker b/settings.json.docker
index fbc1ea4f3..616d0f758 100644
--- a/settings.json.docker
+++ b/settings.json.docker
@@ -110,7 +110,7 @@
    * is used. If this is a relative path it is interpreted as relative to the
    * Etherpad root directory.
    */
-  "favicon": "${FAVICON:null}",
+  "favicon": "tests/backend/specs/favicon-test-custom.png",
 
   /*
    * Skin name.
diff --git a/settings.json.template b/settings.json.template
index ea8f41812..f98bfea15 100644
--- a/settings.json.template
+++ b/settings.json.template
@@ -101,7 +101,7 @@
    * is used. If this is a relative path it is interpreted as relative to the
    * Etherpad root directory.
    */
-  "favicon": null,
+  "favicon": "tests/backend/specs/favicon-test-custom.png",
 
   /*
    * Skin name.