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-rw-r--r--gdb/ser-unix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c
index 5a1ec1dc14f..73555b27a0a 100644
--- a/gdb/ser-unix.c
+++ b/gdb/ser-unix.c
@@ -927,7 +927,7 @@ do_unix_readchar (serial_t scb, int timeout)
}
status = ser_unix_wait_for (scb, delta);
- timeout -= delta;
+ timeout = (timeout <= 0) ? timeout : (timeout - delta);
/* If we got a character or an error back from wait_for, then we can
break from the loop before the timeout is completed. */