diff --git a/include/nuttx/input/touchscreen.h b/include/nuttx/input/touchscreen.h
index 0f4190e3231..f93a4eb3005 100644
--- a/include/nuttx/input/touchscreen.h
+++ b/include/nuttx/input/touchscreen.h
@@ -267,7 +267,7 @@ struct touch_lowerhalf_s
    *   buflen  - User defined specific buffer size.
    *
    * Return Value:
-   *   Number of bytes written；a negated errno value on failure.
+   *   Number of bytes written; a negated errno value on failure.
    *
    **************************************************************************/