diff --git a/PCbuild/prepare_ssl.py b/PCbuild/prepare_ssl.py
index 671e526f9cf..4203dab2f8e 100644
--- a/PCbuild/prepare_ssl.py
+++ b/PCbuild/prepare_ssl.py
@@ -1,3 +1,4 @@
+#! /usr/bin/env python3
 # Script for preparing OpenSSL for building on Windows.
 # Uses Perl to create nmake makefiles and otherwise prepare the way
 # for building on 32 or 64 bit platforms.
diff --git a/PCbuild/python3dll.vcxproj b/PCbuild/python3dll.vcxproj
index b03d09fa39f..18ff4a83e91 100644
--- a/PCbuild/python3dll.vcxproj
+++ b/PCbuild/python3dll.vcxproj
@@ -109,7 +109,7 @@
       </_Lines>
     </ItemGroup>
     <MakeDir Directories="$(IntDir)" />
-    <WriteLinesToFile File="$(IntDir)python3_d.def" Lines="@(_Lines->'%(New)')" />
+    <WriteLinesToFile File="$(IntDir)python3_d.def" Lines="@(_Lines->'%(New)')" Overwrite="true" />
   </Target>
   
   <Target Name="BuildStubDef" BeforeTargets="PreLinkEvent" Inputs="..\PC\python3.def" Outputs="$(IntDir)python3stub.def">
@@ -132,7 +132,7 @@
       <_Lines Include="@(_Symbols->'%(Symbol)')" />
     </ItemGroup>
     <MakeDir Directories="$(IntDir)" />
-    <WriteLinesToFile File="$(IntDir)python3stub.def" Lines="@(_Lines)" />
+    <WriteLinesToFile File="$(IntDir)python3stub.def" Lines="@(_Lines)" Overwrite="true" />
   </Target>
   <Target Name="_CleanStubDef" BeforeTargets="CoreClean">
     <ItemGroup>