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-rw-r--r--generic/tclIOCmd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclIOCmd.c b/generic/tclIOCmd.c
index be37fbd..5127b99 100644
--- a/generic/tclIOCmd.c
+++ b/generic/tclIOCmd.c
@@ -1169,7 +1169,7 @@ Tcl_OpenObjCmd(
} else {
int flags = TCL_STDERR | TCL_ENFORCE_MODE;
- switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
+ switch (mode & O_ACCMODE) {
case O_RDONLY:
flags |= TCL_STDOUT;
break;