diff --git a/src/Portable/Portable.csproj b/src/Portable/Portable.csproj
index 27eeda98..03210c27 100644
--- a/src/Portable/Portable.csproj
+++ b/src/Portable/Portable.csproj
@@ -11,7 +11,7 @@
     <RootNamespace>MathNet.Numerics</RootNamespace>
     <AssemblyName>MathNet.Numerics</AssemblyName>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <TargetFrameworkProfile>Profile42</TargetFrameworkProfile>
+    <TargetFrameworkProfile>Profile37</TargetFrameworkProfile>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
   </PropertyGroup>