diff --git a/test/k4FWCoreTest/options/ExampleFunctionalTransformerRuntimeCollections.py b/test/k4FWCoreTest/options/ExampleFunctionalTransformerRuntimeCollections.py
index e2e5a9d4..0f85a361 100644
--- a/test/k4FWCoreTest/options/ExampleFunctionalTransformerRuntimeCollections.py
+++ b/test/k4FWCoreTest/options/ExampleFunctionalTransformerRuntimeCollections.py
@@ -31,15 +31,15 @@
 
 producer0 = ExampleFunctionalProducer(
     "Producer0",
-    OutputCollection="MCParticles0",
+    OutputCollection=["MCParticles0"],
 )
 producer1 = ExampleFunctionalProducer(
     "Producer1",
-    OutputCollection="MCParticles1",
+    OutputCollection=["MCParticles1"],
 )
 producer2 = ExampleFunctionalProducer(
     "Producer2",
-    OutputCollection="MCParticles2",
+    OutputCollection=["MCParticles2"],
 )
 
 transformer = ExampleFunctionalTransformerRuntimeCollections(
@@ -50,17 +50,17 @@
 
 consumer0 = ExampleFunctionalConsumer(
     "Consumer0",
-    InputCollection="NewMCParticles0",
+    InputCollection=["NewMCParticles0"],
     Offset=0,
 )
 consumer1 = ExampleFunctionalConsumer(
     "Consumer1",
-    InputCollection="NewMCParticles1",
+    InputCollection=["NewMCParticles1"],
     Offset=0,
 )
 consumer2 = ExampleFunctionalConsumer(
     "Consumer2",
-    InputCollection="NewMCParticles2",
+    InputCollection=["NewMCParticles2"],
     Offset=0,
 )