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-rw-r--r--win/tclWinInt.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/win/tclWinInt.h b/win/tclWinInt.h
index 882b811..22ad8e9 100644
--- a/win/tclWinInt.h
+++ b/win/tclWinInt.h
@@ -33,6 +33,12 @@
# define TCL_I_MODIFIER ""
#endif
+#ifdef _WIN64
+# define TCL_I_MODIFIER "I"
+#else
+# define TCL_I_MODIFIER ""
+#endif
+
/*
* Declarations of functions that are not accessible by way of the
* stubs table.