diff --git a/textscreen/txt_window.c b/textscreen/txt_window.c
index 54f84fdb..aca34e57 100644
--- a/textscreen/txt_window.c
+++ b/textscreen/txt_window.c
@@ -52,7 +52,7 @@ void TXT_SetWindowAction(txt_window_t *window,
     }
 }
 
-txt_window_t *TXT_NewWindow(char *title)
+txt_window_t *TXT_NewWindow(const char *title)
 {
     int i;
 
diff --git a/textscreen/txt_window.h b/textscreen/txt_window.h
index 13a0e171..f9cc4754 100644
--- a/textscreen/txt_window.h
+++ b/textscreen/txt_window.h
@@ -100,7 +100,7 @@ struct txt_window_s
  *                     representing the new window.
  */
 
-txt_window_t *TXT_NewWindow(char *title);
+txt_window_t *TXT_NewWindow(const char *title);
 
 /**
  * Close a window.