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-rw-r--r--include/hw/virtio/virtio-serial.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/hw/virtio/virtio-serial.h b/include/hw/virtio/virtio-serial.h
index 7c71304d10..1d2040b245 100644
--- a/include/hw/virtio/virtio-serial.h
+++ b/include/hw/virtio/virtio-serial.h
@@ -104,7 +104,7 @@ typedef struct VirtIOSerialPortClass {
      * 'len'.  In this case, throttling will be enabled for this port.
      */
     ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
-                         size_t len);
+                         ssize_t len);
 } VirtIOSerialPortClass;
 
 /*