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-rw-r--r--Modules/_pickle.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index 25255368a1..5fbf0995f4 100644
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -1,3 +1,10 @@
+
+/* Core extension modules are built-in on some platforms (e.g. Windows). */
+#ifdef Py_BUILD_CORE
+#define Py_BUILD_CORE_MODULE
+#undef Py_BUILD_CORE
+#endif
+
#include "Python.h"
#include "structmember.h"