diff --git a/src/TestData/Data.cs b/src/TestData/Data.cs
index 73174079..f4233283 100644
--- a/src/TestData/Data.cs
+++ b/src/TestData/Data.cs
@@ -6,7 +6,7 @@ namespace MathNet.Numerics.TestData
 {
     public static class Data
     {
-#if NETSTANDARD1_3
+#if NETSTANDARD
         static readonly Assembly DataAssembly = typeof(Data).GetTypeInfo().Assembly;
 #else
         static readonly Assembly DataAssembly = typeof (Data).Assembly;
diff --git a/src/TestData/TestData-2017.csproj b/src/TestData/TestData-2017.csproj
index a84dd6b4..643226bd 100644
--- a/src/TestData/TestData-2017.csproj
+++ b/src/TestData/TestData-2017.csproj
@@ -50,6 +50,9 @@
         <Prefer32Bit>false</Prefer32Bit>
         <LangVersion>6</LangVersion>
     </PropertyGroup>
+    <PropertyGroup Condition="'$(TargetFramework)'=='netstandard1.1'">
+        <DefineConstants>NETSTANDARD</DefineConstants>
+    </PropertyGroup>
     <ItemGroup>
         <Reference Include="System" />
         <Reference Include="System.Core" />