diff --git a/src/Numerics/IntegralTransforms/Fourier.Bluestein.cs b/src/Numerics/IntegralTransforms/Fourier.Bluestein.cs
index 2477ad5a..820c88e3 100644
--- a/src/Numerics/IntegralTransforms/Fourier.Bluestein.cs
+++ b/src/Numerics/IntegralTransforms/Fourier.Bluestein.cs
@@ -156,7 +156,7 @@ namespace MathNet.Numerics.IntegralTransforms
             int n = samples.Length;
             if (n.IsPowerOfTwo())
             {
-                Radix2(samples, exponentSign);
+                Radix2Parallel(samples, exponentSign);
                 return;
             }
 
diff --git a/src/Numerics/IntegralTransforms/Fourier.RadixN.cs b/src/Numerics/IntegralTransforms/Fourier.RadixN.cs
index 559c5d86..98564ee5 100644
--- a/src/Numerics/IntegralTransforms/Fourier.RadixN.cs
+++ b/src/Numerics/IntegralTransforms/Fourier.RadixN.cs
@@ -134,7 +134,7 @@ namespace MathNet.Numerics.IntegralTransforms
             {
                 var size = levelSize;
 
-                CommonParallel.For(0, size, (u, v) =>
+                CommonParallel.For(0, size, 64, (u, v) =>
                 {
                     for (int i = u; i < v; i++)
                     {