diff --git a/textscreen/txt_separator.c b/textscreen/txt_separator.c
index 1905bc44..1f30fc64 100644
--- a/textscreen/txt_separator.c
+++ b/textscreen/txt_separator.c
@@ -98,7 +98,7 @@ txt_widget_class_t txt_separator_class =
     NULL,
 };
 
-txt_separator_t *TXT_NewSeparator(char *label)
+txt_separator_t *TXT_NewSeparator(const char *label)
 {
     txt_separator_t *separator;
 
diff --git a/textscreen/txt_separator.h b/textscreen/txt_separator.h
index 5c88938e..665c5a34 100644
--- a/textscreen/txt_separator.h
+++ b/textscreen/txt_separator.h
@@ -50,7 +50,7 @@ extern txt_widget_class_t txt_separator_class;
  * @return              The new separator widget.
  */
 
-txt_separator_t *TXT_NewSeparator(char *label);
+txt_separator_t *TXT_NewSeparator(const char *label);
 
 /**
  * Change the label on a separator.