diff --git a/src/Numerics/Optimization/IObjectiveModel.cs b/src/Numerics/Optimization/IObjectiveModel.cs
index 45f94409..72c15391 100644
--- a/src/Numerics/Optimization/IObjectiveModel.cs
+++ b/src/Numerics/Optimization/IObjectiveModel.cs
@@ -41,11 +41,11 @@ namespace MathNet.Numerics.Optimization
         /// <summary>
         /// Get the number of calls to function.
         /// </summary>
-        int FunctionEvaluations { get; }
+        int FunctionEvaluations { get; set; }
         /// <summary>
         /// Get the number of calls to jacobian.
         /// </summary>
-        int JacobianEvaluations { get; }
+        int JacobianEvaluations { get; set; }
 
         /// <summary>
         /// Get the degree of freedom.
diff --git a/src/Numerics/Optimization/LevenbergMarquardtMinimizer.cs b/src/Numerics/Optimization/LevenbergMarquardtMinimizer.cs
index 681eb3dd..2b54d194 100644
--- a/src/Numerics/Optimization/LevenbergMarquardtMinimizer.cs
+++ b/src/Numerics/Optimization/LevenbergMarquardtMinimizer.cs
@@ -120,6 +120,10 @@ namespace MathNet.Numerics.Optimization
 
             ExitCondition exitCondition = ExitCondition.None;
 
+            // Initialize objective
+            objective.FunctionEvaluations = 0;
+            objective.JacobianEvaluations = 0;
+
             // First, calculate function values and setup variables
             objective.EvaluateFunction(initialGuess);
             var P = objective.Parameters; // current parameters
diff --git a/src/Numerics/Optimization/ObjectiveModels/FittingObjectiveModel.cs b/src/Numerics/Optimization/ObjectiveModels/FittingObjectiveModel.cs
index ce81fb54..6b9fba7c 100644
--- a/src/Numerics/Optimization/ObjectiveModels/FittingObjectiveModel.cs
+++ b/src/Numerics/Optimization/ObjectiveModels/FittingObjectiveModel.cs
@@ -125,11 +125,11 @@ namespace MathNet.Numerics.Optimization.ObjectiveModels
         /// <summary>
         /// Get the number of calls to function.
         /// </summary>
-        public int FunctionEvaluations { get; private set; }
+        public int FunctionEvaluations { get; set; }
         /// <summary>
         /// Get the number of calls to jacobian.
         /// </summary>
-        public int JacobianEvaluations { get; private set; }
+        public int JacobianEvaluations { get; set; }
 
         /// <summary>
         /// Set or get the desired accuracy order of the numerical jacobian.
diff --git a/src/Numerics/Optimization/TrustRegionDogLegMinimizer.cs b/src/Numerics/Optimization/TrustRegionDogLegMinimizer.cs
index a8ab570f..85d4fef0 100644
--- a/src/Numerics/Optimization/TrustRegionDogLegMinimizer.cs
+++ b/src/Numerics/Optimization/TrustRegionDogLegMinimizer.cs
@@ -121,6 +121,10 @@ namespace MathNet.Numerics.Optimization
 
             ExitCondition exitCondition = ExitCondition.None;
 
+            // Initialize objective
+            objective.FunctionEvaluations = 0;
+            objective.JacobianEvaluations = 0;
+
             // First, calculate function values and setup variables
             objective.EvaluateFunction(initialGuess);
             var P = objective.Parameters; // current parameters