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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 a76865d..2f6659c 100644
--- a/win/tclWinInt.h
+++ b/win/tclWinInt.h
@@ -35,6 +35,12 @@
#define VER_PLATFORM_WIN32_CE 3
#endif
+#ifdef _WIN64
+# define TCL_I_MODIFIER "I"
+#else
+# define TCL_I_MODIFIER ""
+#endif
+
/*
* The following structure keeps track of whether we are using the
* multi-byte or the wide-character interfaces to the operating system.