diff --git a/Misc/NEWS.d/next/Tests/2020-11-13-21-51-34.bpo-40754.Ekoxkg.rst b/Misc/NEWS.d/next/Tests/2020-11-13-21-51-34.bpo-40754.Ekoxkg.rst
new file mode 100644
index 00000000000..4bd423b54a4
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2020-11-13-21-51-34.bpo-40754.Ekoxkg.rst
@@ -0,0 +1 @@
+Include ``_testinternalcapi`` module in Windows installer for test suite
diff --git a/Tools/msi/test/test_files.wxs b/Tools/msi/test/test_files.wxs
index 82a9115f759..9127ce89481 100644
--- a/Tools/msi/test/test_files.wxs
+++ b/Tools/msi/test/test_files.wxs
@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
-    <?define exts=_testcapi;_ctypes_test;_testbuffer;_testimportmultiple;_testmultiphase;_testconsole ?>
+    <?define exts=_testcapi;_ctypes_test;_testbuffer;_testimportmultiple;_testmultiphase;_testconsole;_testinternalcapi ?>
     <Fragment>
         <ComponentGroup Id="test_extensions">
             <?foreach ext in $(var.exts)?>