diff --git a/unsupported/Eigen/src/Splines/SplineFitting.h b/unsupported/Eigen/src/Splines/SplineFitting.h
index 8e6a5aaed..c761a9b3d 100644
--- a/unsupported/Eigen/src/Splines/SplineFitting.h
+++ b/unsupported/Eigen/src/Splines/SplineFitting.h
@@ -130,12 +130,12 @@ namespace Eigen
   
     ParameterVectorType temporaryParameters(numParameters + 1);
     KnotVectorType derivativeKnots(numInternalDerivatives);
-    for (unsigned int i = 0; i < numAverageKnots - 1; ++i)
+    for (DenseIndex i = 0; i < numAverageKnots - 1; ++i)
     {
       temporaryParameters[0] = averageKnots[i];
       ParameterVectorType parameterIndices(numParameters);
       int temporaryParameterIndex = 1;
-      for (int j = 0; j < numParameters; ++j)
+      for (DenseIndex j = 0; j < numParameters; ++j)
       {
         Scalar parameter = parameters[j];
         if (parameter >= averageKnots[i] && parameter < averageKnots[i + 1])