diff --git a/src/Numerics/Providers/Common/Cuda/CudaProvider.cs b/src/Numerics/Providers/Common/Cuda/CudaProvider.cs
index 53d2ded5..14c21127 100644
--- a/src/Numerics/Providers/Common/Cuda/CudaProvider.cs
+++ b/src/Numerics/Providers/Common/Cuda/CudaProvider.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using System.Collections.Generic;
 
@@ -105,3 +107,5 @@ namespace MathNet.Numerics.Providers.Common.Cuda
         }
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/Common/Cuda/CudaProviderCapabilities.cs b/src/Numerics/Providers/Common/Cuda/CudaProviderCapabilities.cs
index 90002973..6856ab49 100644
--- a/src/Numerics/Providers/Common/Cuda/CudaProviderCapabilities.cs
+++ b/src/Numerics/Providers/Common/Cuda/CudaProviderCapabilities.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 namespace MathNet.Numerics.Providers.Common.Cuda
 {
     internal enum ProviderPlatform : int
@@ -47,3 +49,5 @@ namespace MathNet.Numerics.Providers.Common.Cuda
         LinearAlgebraMinor = 129,
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/Common/Mkl/MklProvider.cs b/src/Numerics/Providers/Common/Mkl/MklProvider.cs
index f9879b83..b2007a8d 100644
--- a/src/Numerics/Providers/Common/Mkl/MklProvider.cs
+++ b/src/Numerics/Providers/Common/Mkl/MklProvider.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using System.Collections.Generic;
 
@@ -256,3 +258,5 @@ namespace MathNet.Numerics.Providers.Common.Mkl
         }
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/Common/Mkl/MklProviderCapabilities.cs b/src/Numerics/Providers/Common/Mkl/MklProviderCapabilities.cs
index af0f971d..4e692bab 100644
--- a/src/Numerics/Providers/Common/Mkl/MklProviderCapabilities.cs
+++ b/src/Numerics/Providers/Common/Mkl/MklProviderCapabilities.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 namespace MathNet.Numerics.Providers.Common.Mkl
 {
     internal enum ProviderPlatform : int
@@ -55,3 +57,5 @@ namespace MathNet.Numerics.Providers.Common.Mkl
         FourierTransformMinor = 385
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/Common/NativeProviderLoader.cs b/src/Numerics/Providers/Common/NativeProviderLoader.cs
index 0b4f19e4..51c446bf 100644
--- a/src/Numerics/Providers/Common/NativeProviderLoader.cs
+++ b/src/Numerics/Providers/Common/NativeProviderLoader.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -35,8 +37,6 @@ using System.Runtime.InteropServices;
 using System.Security;
 using System.Threading;
 
-#if NATIVE
-
 namespace MathNet.Numerics.Providers.Common
 {
     /// <summary>
@@ -243,4 +243,4 @@ namespace MathNet.Numerics.Providers.Common
     }
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/Numerics/Providers/Common/OpenBlas/OpenBlasProvider.cs b/src/Numerics/Providers/Common/OpenBlas/OpenBlasProvider.cs
index 473ee263..0261ee1b 100644
--- a/src/Numerics/Providers/Common/OpenBlas/OpenBlasProvider.cs
+++ b/src/Numerics/Providers/Common/OpenBlas/OpenBlasProvider.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using System.Collections.Generic;
 
@@ -119,3 +121,5 @@ namespace MathNet.Numerics.Providers.Common.OpenBlas
         }
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/Common/OpenBlas/OpenBlasProviderCapabilities.cs b/src/Numerics/Providers/Common/OpenBlas/OpenBlasProviderCapabilities.cs
index 858c710e..fdabbf03 100644
--- a/src/Numerics/Providers/Common/OpenBlas/OpenBlasProviderCapabilities.cs
+++ b/src/Numerics/Providers/Common/OpenBlas/OpenBlasProviderCapabilities.cs
@@ -27,6 +27,8 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 namespace MathNet.Numerics.Providers.Common.OpenBlas
 {
     internal enum ProviderPlatform : int
@@ -49,3 +51,5 @@ namespace MathNet.Numerics.Providers.Common.OpenBlas
         LinearAlgebraMinor = 129
     }
 }
+
+#endif
diff --git a/src/Numerics/Providers/FourierTransform/FourierTransformControl.cs b/src/Numerics/Providers/FourierTransform/FourierTransformControl.cs
index d989432a..d553cd27 100644
--- a/src/Numerics/Providers/FourierTransform/FourierTransformControl.cs
+++ b/src/Numerics/Providers/FourierTransform/FourierTransformControl.cs
@@ -80,18 +80,22 @@ namespace MathNet.Numerics.Providers.FourierTransform
 
         public static void UseDefault()
         {
+#if NATIVE
             var value = Environment.GetEnvironmentVariable(EnvVarFFTProvider);
             switch (value != null ? value.ToUpperInvariant() : string.Empty)
             {
-#if NATIVE
+
                 case "MKL":
                     UseNativeMKL();
                     break;
-#endif
+
                 default:
                     UseBest();
                     break;
             }
+#else
+            UseManaged();
+#endif
         }
     }
 }
diff --git a/src/Numerics/Providers/LinearAlgebra/Cuda/CudaLinearAlgebraProvider.cs b/src/Numerics/Providers/LinearAlgebra/Cuda/CudaLinearAlgebraProvider.cs
index 6ae60291..bfd0cd99 100644
--- a/src/Numerics/Providers/LinearAlgebra/Cuda/CudaLinearAlgebraProvider.cs
+++ b/src/Numerics/Providers/LinearAlgebra/Cuda/CudaLinearAlgebraProvider.cs
@@ -27,11 +27,11 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using MathNet.Numerics.Providers.Common.Cuda;
 
-#if NATIVE
-
 namespace MathNet.Numerics.Providers.LinearAlgebra.Cuda
 {
     /// <summary>
diff --git a/src/Numerics/Providers/LinearAlgebra/LinearAlgebraControl.cs b/src/Numerics/Providers/LinearAlgebra/LinearAlgebraControl.cs
index a4cf8882..e3712c46 100644
--- a/src/Numerics/Providers/LinearAlgebra/LinearAlgebraControl.cs
+++ b/src/Numerics/Providers/LinearAlgebra/LinearAlgebraControl.cs
@@ -95,10 +95,10 @@ namespace MathNet.Numerics.Providers.LinearAlgebra
 
         public static void UseDefault()
         {
+#if NATIVE
             var value = Environment.GetEnvironmentVariable(EnvVarLAProvider);
             switch (value != null ? value.ToUpperInvariant() : string.Empty)
             {
-#if NATIVE
                 case "MKL":
                     UseNativeMKL();
                     break;
@@ -110,11 +110,13 @@ namespace MathNet.Numerics.Providers.LinearAlgebra
                 case "OPENBLAS":
                     UseNativeOpenBLAS();
                     break;
-#endif
                 default:
                     UseBest();
                     break;
             }
+#else
+            UseManaged();
+#endif
         }
     }
 }
diff --git a/src/Numerics/Providers/LinearAlgebra/Mkl/MklLinearAlgebraProvider.cs b/src/Numerics/Providers/LinearAlgebra/Mkl/MklLinearAlgebraProvider.cs
index 1de85759..46a48110 100644
--- a/src/Numerics/Providers/LinearAlgebra/Mkl/MklLinearAlgebraProvider.cs
+++ b/src/Numerics/Providers/LinearAlgebra/Mkl/MklLinearAlgebraProvider.cs
@@ -27,11 +27,11 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if NATIVE
+
 using System;
 using MathNet.Numerics.Providers.Common.Mkl;
 
-#if NATIVE
-
 namespace MathNet.Numerics.Providers.LinearAlgebra.Mkl
 {
     /// <summary>