diff --git a/src/perf_tests/Python.PerformanceTests.csproj b/src/perf_tests/Python.PerformanceTests.csproj
index 25af89db0..f84e556aa 100644
--- a/src/perf_tests/Python.PerformanceTests.csproj
+++ b/src/perf_tests/Python.PerformanceTests.csproj
@@ -28,7 +28,7 @@
   </ItemGroup>
 
   <Target Name="GetRuntimeLibBuildOutput" BeforeTargets="Build">
-    <MSBuild Projects="..\runtime\Python.Runtime.15.csproj" Properties="PYTHONNET_PY3_VERSION=PYTHON35;Configuration=$(Configuration);TargetFramework=net40;Python3Version=PYTHON35;OutputPath=bin\for_perf\">
+    <MSBuild Projects="..\runtime\Python.Runtime.15.csproj" Properties="PYTHONNET_PY3_VERSION=PYTHON38;Configuration=$(Configuration);TargetFramework=net40;Python3Version=PYTHON38;OutputPath=bin\for_perf\">
       <Output TaskParameter="TargetOutputs" ItemName="NewPythonRuntime" />
     </MSBuild>
   </Target>
diff --git a/src/runtime/runtime.cs b/src/runtime/runtime.cs
index 7acdc0f7e..2d523758b 100644
--- a/src/runtime/runtime.cs
+++ b/src/runtime/runtime.cs
@@ -43,18 +43,14 @@ public class Runtime
 #error You must define either UCS2 or UCS4!
 #endif
 
-#if PYTHON34
-        const string _minor = "4";
-#elif PYTHON35
-        const string _minor = "5";
-#elif PYTHON36
+#if PYTHON36
         const string _minor = "6";
 #elif PYTHON37
         const string _minor = "7";
 #elif PYTHON38
         const string _minor = "8";
 #else
-#error You must define one of PYTHON34 to PYTHON38
+#error You must define one of PYTHON36 to PYTHON38
 #endif
 
 #if WINDOWS