diff --git a/include/ui/input.h b/include/ui/input.h
index 18088babe2..a1560cac0f 100644
--- a/include/ui/input.h
+++ b/include/ui/input.h
@@ -73,7 +73,7 @@ void qemu_input_queue_btn(QemuConsole *src, InputButton btn, bool down);
 void qemu_input_update_buttons(QemuConsole *src, uint32_t *button_map,
                                uint32_t button_old, uint32_t button_new);
 
-bool qemu_input_is_absolute(QemuConsole *con);
+bool qemu_input_is_absolute(const QemuConsole *con);
 int qemu_input_scale_axis(int value,
                           int min_in, int max_in,
                           int min_out, int max_out);
diff --git a/tools/qemu-vnc/input.c b/tools/qemu-vnc/input.c
index dd6a55ce9e..a1e9ff0086 100644
--- a/tools/qemu-vnc/input.c
+++ b/tools/qemu-vnc/input.c
@@ -160,7 +160,7 @@ void qemu_input_event_sync(void)
     }
 }
 
-bool qemu_input_is_absolute(QemuConsole *con)
+bool qemu_input_is_absolute(const QemuConsole *con)
 {
     QemuDBusDisplay1Mouse *mouse;
 
diff --git a/ui/input.c b/ui/input.c
index 40a0d507de..b82622c864 100644
--- a/ui/input.c
+++ b/ui/input.c
@@ -466,7 +466,7 @@ void qemu_input_update_buttons(QemuConsole *src, uint32_t *button_map,
     }
 }
 
-bool qemu_input_is_absolute(QemuConsole *con)
+bool qemu_input_is_absolute(const QemuConsole *con)
 {
     QemuInputHandlerState *s;