diff --git a/src/test/java/org/opentripplanner/test/support/JsonAssertions.java b/src/test/java/org/opentripplanner/test/support/JsonAssertions.java
index e836ace81fd..1fe87268eee 100644
--- a/src/test/java/org/opentripplanner/test/support/JsonAssertions.java
+++ b/src/test/java/org/opentripplanner/test/support/JsonAssertions.java
@@ -32,10 +32,11 @@ public static void assertEqualJson(String expected, JsonNode actual) {
       assertEquals(
         exp,
         actualNode,
-        "Expected '%s' but actual was '%s'".formatted(
-            JsonSupport.prettyPrint(exp),
-            JsonSupport.prettyPrint(actualNode)
-          )
+        () ->
+          "Expected '%s' but actual was '%s'".formatted(
+              JsonSupport.prettyPrint(exp),
+              JsonSupport.prettyPrint(actualNode)
+            )
       );
     } catch (JsonProcessingException e) {
       throw new RuntimeException(e);