diff --git a/textscreen/txt_label.c b/textscreen/txt_label.c
index 61df188d..191064cd 100644
--- a/textscreen/txt_label.c
+++ b/textscreen/txt_label.c
@@ -113,7 +113,7 @@ txt_widget_class_t txt_label_class =
     NULL,
 };
 
-void TXT_SetLabel(txt_label_t *label, char *value)
+void TXT_SetLabel(txt_label_t *label, const char *value)
 {
     char *p;
     unsigned int y;
diff --git a/textscreen/txt_label.h b/textscreen/txt_label.h
index 3786843a..546e83e6 100644
--- a/textscreen/txt_label.h
+++ b/textscreen/txt_label.h
@@ -58,7 +58,7 @@ txt_label_t *TXT_NewLabel(char *label);
  * @param value         The string to display (UTF-8 format).
  */
 
-void TXT_SetLabel(txt_label_t *label, char *value);
+void TXT_SetLabel(txt_label_t *label, const char *value);
 
 /**
  * Set the background color of a label widget.