diff --git a/test/k4FWCoreTest/src/components/TestUniqueIDGenSvc.cpp b/test/k4FWCoreTest/src/components/TestUniqueIDGenSvc.cpp
index 00d5b677..3bc07bb8 100644
--- a/test/k4FWCoreTest/src/components/TestUniqueIDGenSvc.cpp
+++ b/test/k4FWCoreTest/src/components/TestUniqueIDGenSvc.cpp
@@ -21,7 +21,9 @@
 DECLARE_COMPONENT(TestUniqueIDGenSvc)
 
 TestUniqueIDGenSvc::TestUniqueIDGenSvc(const std::string& aName, ISvcLocator* aSvcLoc)
-    : Gaudi::Algorithm(aName, aSvcLoc) {}
+    : Gaudi::Algorithm(aName, aSvcLoc) {
+  
+}
 
 TestUniqueIDGenSvc::~TestUniqueIDGenSvc() {}
 
diff --git a/test/k4FWCoreTest/src/components/k4FWCoreTest_AlgorithmWithTFile.cpp b/test/k4FWCoreTest/src/components/k4FWCoreTest_AlgorithmWithTFile.cpp
index 8448e060..d93b2347 100644
--- a/test/k4FWCoreTest/src/components/k4FWCoreTest_AlgorithmWithTFile.cpp
+++ b/test/k4FWCoreTest/src/components/k4FWCoreTest_AlgorithmWithTFile.cpp
@@ -28,6 +28,8 @@ k4FWCoreTest_AlgorithmWithTFile::k4FWCoreTest_AlgorithmWithTFile(const std::stri
     : Gaudi::Algorithm(aName, aSvcLoc) {
   declareProperty("mcparticles", m_mcParticleHandle, "Dummy Particle collection (output)");
   declareProperty("trackhits", m_simTrackerHitHandle, "Dummy Hit collection (output)");
+  // Set Cardinality to 1 because this algorithm is not prepared to run in parallel
+  setProperty("Cardinality", 1).ignore();
 }
 
 k4FWCoreTest_AlgorithmWithTFile::~k4FWCoreTest_AlgorithmWithTFile() {}
diff --git a/test/k4FWCoreTest/src/components/k4FWCoreTest_HelloWorldAlg.cpp b/test/k4FWCoreTest/src/components/k4FWCoreTest_HelloWorldAlg.cpp
index 380a4bec..a576a298 100644
--- a/test/k4FWCoreTest/src/components/k4FWCoreTest_HelloWorldAlg.cpp
+++ b/test/k4FWCoreTest/src/components/k4FWCoreTest_HelloWorldAlg.cpp
@@ -22,7 +22,10 @@
 DECLARE_COMPONENT(k4FWCoreTest_HelloWorldAlg)
 
 k4FWCoreTest_HelloWorldAlg::k4FWCoreTest_HelloWorldAlg(const std::string& aName, ISvcLocator* aSvcLoc)
-    : Gaudi::Algorithm(aName, aSvcLoc) {}
+    : Gaudi::Algorithm(aName, aSvcLoc) {
+  // Set Cardinality to 1 because this algorithm is not prepared to run in parallel
+  setProperty("Cardinality", 1).ignore();
+}
 
 k4FWCoreTest_HelloWorldAlg::~k4FWCoreTest_HelloWorldAlg() {}