diff --git a/Param/Distrib/RangedDistributions.cpp b/Param/Distrib/RangedDistributions.cpp
index 97b669f6956fff9701408850a810ae71446e3bee..eaac1fdd5f7a174c9645a3308fa191236225759c 100644
--- a/Param/Distrib/RangedDistributions.cpp
+++ b/Param/Distrib/RangedDistributions.cpp
@@ -44,13 +44,13 @@ IRangedDistribution::IRangedDistribution(size_t n_samples, double sigma_factor)
 
 IRangedDistribution::~IRangedDistribution() = default;
 
-std::vector<ParameterSample> IRangedDistribution::generateSamples(double mean, double stddev) const
+std::vector<ParameterSample> IRangedDistribution::generateSamples(double stddev) const
 {
     if (stddev == 0) // it's a delta distribution
-        return {{mean, 1.0}};
+        return {{0., 1.0}};
     ASSERT(stddev > 0);
 
-    auto generator = distribution(mean, stddev);
+    auto generator = distribution(0., stddev);
     return generator->equidistantSamples(m_n_samples, m_sigma_factor);
 }
 
diff --git a/Param/Distrib/RangedDistributions.h b/Param/Distrib/RangedDistributions.h
index e47de972d5a3c4f26b5a4dd130cf4e4a04738d6b..d6852bf6d54806f2167408de099c709bd36ad7d0 100644
--- a/Param/Distrib/RangedDistributions.h
+++ b/Param/Distrib/RangedDistributions.h
@@ -41,7 +41,7 @@ public:
     IRangedDistribution* clone() const override = 0;
 
 #ifndef SWIG
-    std::vector<ParameterSample> generateSamples(double mean, double stddev) const;
+    std::vector<ParameterSample> generateSamples(double stddev) const;
 
     //! Public interface function to underlying IDistribution1D object
     IDistribution1D* distribution(double mean, double stddev) const;
diff --git a/Sim/Scan/ScanResolution.cpp b/Sim/Scan/ScanResolution.cpp
index fb1b71158b673810c8a0aeb2a89467bb24499c7b..341b04d2907077b3ae0ee0409dad26da25a34ef4 100644
--- a/Sim/Scan/ScanResolution.cpp
+++ b/Sim/Scan/ScanResolution.cpp
@@ -32,7 +32,7 @@ ScanResolution* ScanResolution::clone() const
 
 std::vector<ParameterSample> ScanResolution::resolutionSamples() const
 {
-    return rdistribution()->generateSamples(0., m_stddev);
+    return rdistribution()->generateSamples(m_stddev);
 }
 
 size_t ScanResolution::nSamples() const