diff --git a/Core/Samples/inc/ParticleBuilder.h b/Core/Samples/inc/ParticleBuilder.h
index 11ac7dc09f148008338fb022c6de0a1e9d012b88..5d5db5cb1d1b2c8b9ab1d1cb089d3f94c151fced 100644
--- a/Core/Samples/inc/ParticleBuilder.h
+++ b/Core/Samples/inc/ParticleBuilder.h
@@ -36,7 +36,7 @@ public:
     //! @param parameter  variation type
     //! @param scale      global scale factor for probabilities
     void setPrototype(const Particle& particle, std::string name,
-                      const IDistribution1D& param, size_t nbr_samples,
+                      const IDistribution1D& distribution, size_t nbr_samples,
                       double sigma_factor=0.0, double scale=1.0);
 
     //! plant particles in given decoration
diff --git a/Core/Samples/src/ParticleBuilder.cpp b/Core/Samples/src/ParticleBuilder.cpp
index f4530febeb1442583195f9247b9f448c65403365..0666af3ebfa47ad13d6dfe0da5d4ba0d86d5f186 100644
--- a/Core/Samples/src/ParticleBuilder.cpp
+++ b/Core/Samples/src/ParticleBuilder.cpp
@@ -38,14 +38,14 @@ ParticleBuilder::~ParticleBuilder()
 //! Sets prototype for particle production
 
 void ParticleBuilder::setPrototype(const Particle &particle, std::string name,
-    const IDistribution1D &param, size_t nbr_samples, double sigma_factor,
+    const IDistribution1D &distribution, size_t nbr_samples, double sigma_factor,
     double scale)
 {
     delete mp_prototype;
     mp_prototype = particle.clone();
     m_parameter_name = name;
     delete mp_distribution;
-    mp_distribution = param.clone();
+    mp_distribution = distribution.clone();
     m_nbr_samples = nbr_samples;
     m_sigma_factor = sigma_factor;
     m_scale = scale;
diff --git a/Core/StandardSamples/IsGISAXS15Builder.cpp b/Core/StandardSamples/IsGISAXS15Builder.cpp
index 2925902c32556057f2c6db5ee2c355e1a1a1a0f1..728474bedd42074ea0937ac447e4e4637660a3ac 100644
--- a/Core/StandardSamples/IsGISAXS15Builder.cpp
+++ b/Core/StandardSamples/IsGISAXS15Builder.cpp
@@ -50,7 +50,7 @@ ISample *IsGISAXS15Builder::buildSample() const
     DistributionGaussian gauss(5.0*Units::nanometer, 1.25*Units::nanometer);
     ParticleBuilder particle_builder;
     particle_builder.setPrototype(particle_prototype,
-            "/Particle/FormFactorCylinder/radius", gauss, 30, 2.0);
+            "/Particle/FormFactorCylinder/radius", gauss, 30, 3.0);
     particle_builder.plantParticles(particle_layout);
 
     // Set height of each particle to its radius (H/R fixed)
diff --git a/Tests/ReferenceData/BornAgain/isgisaxs15_reference.int.gz b/Tests/ReferenceData/BornAgain/isgisaxs15_reference.int.gz
index b3a2882dae5451fcad48fa232ae3b1733ade4954..ee6cf899404b21ff977fdc253f2c2101c55f17d8 100644
Binary files a/Tests/ReferenceData/BornAgain/isgisaxs15_reference.int.gz and b/Tests/ReferenceData/BornAgain/isgisaxs15_reference.int.gz differ