diff --git a/textscreen/txt_checkbox.c b/textscreen/txt_checkbox.c
index 8610c719..49f66f43 100644
--- a/textscreen/txt_checkbox.c
+++ b/textscreen/txt_checkbox.c
@@ -116,7 +116,7 @@ txt_widget_class_t txt_checkbox_class =
     NULL,
 };
 
-txt_checkbox_t *TXT_NewCheckBox(char *label, int *variable)
+txt_checkbox_t *TXT_NewCheckBox(const char *label, int *variable)
 {
     txt_checkbox_t *checkbox;
 
diff --git a/textscreen/txt_checkbox.h b/textscreen/txt_checkbox.h
index 08f37d44..91e7d61c 100644
--- a/textscreen/txt_checkbox.h
+++ b/textscreen/txt_checkbox.h
@@ -55,7 +55,7 @@ struct txt_checkbox_s
  * @return              Pointer to the new checkbox.
  */
 
-txt_checkbox_t *TXT_NewCheckBox(char *label, int *variable);
+txt_checkbox_t *TXT_NewCheckBox(const char *label, int *variable);
 
 /**
  * Create a new inverted checkbox.