diff --git a/keanu-project/src/test/java/io/improbable/keanu/vertices/dbl/nonprobabilistic/operators/multiple/LambdaModelVertexTest.java b/keanu-project/src/test/java/io/improbable/keanu/vertices/dbl/nonprobabilistic/operators/multiple/LambdaModelVertexTest.java
index <HASH>..<HASH> 100644
--- a/keanu-project/src/test/java/io/improbable/keanu/vertices/dbl/nonprobabilistic/operators/multiple/LambdaModelVertexTest.java
+++ b/keanu-project/src/test/java/io/improbable/keanu/vertices/dbl/nonprobabilistic/operators/multiple/LambdaModelVertexTest.java
@@ -205,7 +205,7 @@ public class LambdaModelVertexTest {
         NetworkSamples posteriorSamples = MetropolisHastings.withDefaultConfig(random).getPosteriorSamples(
             bayesianNetwork,
             inputToModel,
-            250000
+            2500
         );
 
         double averagePosteriorInput = posteriorSamples.getDoubleTensorSamples(inputToModel).getAverages().scalar();
Reduce number of samples to fix broken build