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-rw-r--r--Modules/cStringIO.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 7e75879..b7333fd 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -289,6 +289,7 @@ IO_truncate(IOobject *self, PyObject *args) {
if (pos < 0) pos = self->pos;
if (self->string_size > pos) self->string_size = pos;
+ self->pos = self->string_size;
Py_INCREF(Py_None);
return Py_None;