diff --git a/hw/kdrive/ephyr/hostx.c b/hw/kdrive/ephyr/hostx.c
index f2b458d90..5071289d9 100644
--- a/hw/kdrive/ephyr/hostx.c
+++ b/hw/kdrive/ephyr/hostx.c
@@ -215,7 +215,7 @@ hostx_set_screen_number(EphyrScreenInfo screen, int number)
 }
 
 void
-hostx_set_win_title(EphyrScreenInfo screen, char *extra_text)
+hostx_set_win_title(EphyrScreenInfo screen, const char *extra_text)
 {
     struct EphyrHostScreen *host_screen = host_screen_from_screen_info(screen);
 
diff --git a/hw/kdrive/ephyr/hostx.h b/hw/kdrive/ephyr/hostx.h
index 38b7b3768..f47297c5d 100644
--- a/hw/kdrive/ephyr/hostx.h
+++ b/hw/kdrive/ephyr/hostx.h
@@ -171,7 +171,7 @@ void
  hostx_set_screen_number(EphyrScreenInfo screen, int number);
 
 void
- hostx_set_win_title(EphyrScreenInfo screen, char *extra_text);
+ hostx_set_win_title(EphyrScreenInfo screen, const char *extra_text);
 
 int
  hostx_get_depth(void);