diff --git a/PC/config.c b/PC/config.c
index d8db109f115..72c93811300 100644
--- a/PC/config.c
+++ b/PC/config.c
@@ -66,6 +66,7 @@ extern PyObject* PyInit_atexit(void);
 extern PyObject* _PyWarnings_Init(void);
 extern PyObject* PyInit__string(void);
 extern PyObject* PyInit__stat(void);
+extern PyObject* PyInit__opcode(void);
 
 /* tools/freeze/makeconfig.py marker for additional "extern" */
 /* -- ADDMODULE MARKER 1 -- */
@@ -158,6 +159,7 @@ struct _inittab _PyImport_Inittab[] = {
     {"_pickle", PyInit__pickle},
     {"atexit", PyInit_atexit},
     {"_stat", PyInit__stat},
+    {"_opcode", PyInit__opcode},
 
     /* Sentinel */
     {0, 0}
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index 27c2807a955..4ca9cbed1a4 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -524,6 +524,7 @@
     <ClCompile Include="..\Modules\mathmodule.c" />
     <ClCompile Include="..\Modules\md5module.c" />
     <ClCompile Include="..\Modules\mmapmodule.c" />
+    <ClCompile Include="..\Modules\_opcode.c" />
     <ClCompile Include="..\Modules\_operator.c" />
     <ClCompile Include="..\Modules\parsermodule.c" />
     <ClCompile Include="..\Modules\posixmodule.c" />