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-rw-r--r--libguile/fports.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/fports.c b/libguile/fports.c
index 0632186f2..e765c77a2 100644
--- a/libguile/fports.c
+++ b/libguile/fports.c
@@ -616,7 +616,7 @@ fport_flush (SCM port)
{
scm_port *pt = SCM_PTAB_ENTRY (port);
struct scm_fport *fp = SCM_FSTREAM (port);
- char *ptr = pt->write_buf;
+ unsigned char *ptr = pt->write_buf;
int init_size = pt->write_pos - pt->write_buf;
int remaining = init_size;