diff --git a/legacy/elementary/ChangeLog b/legacy/elementary/ChangeLog
index 87489c4530..1af3046b58 100644
--- a/legacy/elementary/ChangeLog
+++ b/legacy/elementary/ChangeLog
@@ -192,3 +192,7 @@
 2012-06-14 Michael Bouchaud
 	* Add an enum to Elm_Calendar_Mark_Repeat_Type:
 	ELM_CALENDAR_LAST_DAY_OF_MONTH
+
+2012-06-15 Michael Bouchaud
+	* elm_progressbar: elm_progressbar_format_function_set to add a callback
+	function to format the unit string.
diff --git a/legacy/elementary/src/lib/elm_progressbar.c b/legacy/elementary/src/lib/elm_progressbar.c
index 61f2b64f31..1c23e0a218 100644
--- a/legacy/elementary/src/lib/elm_progressbar.c
+++ b/legacy/elementary/src/lib/elm_progressbar.c
@@ -23,6 +23,9 @@ struct _Elm_Progressbar_Smart_Data
    Eina_Bool             inverted : 1;
    Eina_Bool             pulse : 1;
    Eina_Bool             pulse_state : 1;
+
+   char                 *(*unit_format_func)(double val);
+   void                  (*unit_format_free)(char *str);
 };
 
 #define ELM_PROGRESSBAR_DATA_GET(o, sd) \
@@ -74,7 +77,15 @@ _units_set(Evas_Object *obj)
 {
    ELM_PROGRESSBAR_DATA_GET(obj, sd);
 
-   if (sd->units)
+   if (sd->unit_format_func)
+     {
+        char *buf;
+
+        buf = sd->unit_format_func(sd->val);
+        elm_layout_text_set(obj, "elm.text.status", buf);
+        if (sd->unit_format_free) sd->unit_format_free(buf);
+     }
+   else if (sd->units)
      {
         char buf[1024];
 
@@ -428,6 +439,19 @@ elm_progressbar_unit_format_get(const Evas_Object *obj)
    return sd->units;
 }
 
+EAPI void
+elm_progressbar_unit_format_function_set(Evas_Object *obj, char *(func)(double), void (*free_func) (char *))
+{
+   ELM_PROGRESSBAR_CHECK(obj);
+   ELM_PROGRESSBAR_DATA_GET(obj, sd);
+
+   sd->unit_format_func = func;
+   sd->unit_format_free = free_func;
+
+   _units_set(obj);
+   elm_layout_sizing_eval(obj);
+}
+
 EAPI void
 elm_progressbar_horizontal_set(Evas_Object *obj,
                                Eina_Bool horizontal)
diff --git a/legacy/elementary/src/lib/elm_progressbar.h b/legacy/elementary/src/lib/elm_progressbar.h
index 989433dedb..40b8840e51 100644
--- a/legacy/elementary/src/lib/elm_progressbar.h
+++ b/legacy/elementary/src/lib/elm_progressbar.h
@@ -228,6 +228,23 @@ EAPI void                         elm_progressbar_unit_format_set(Evas_Object *o
  */
 EAPI const char                  *elm_progressbar_unit_format_get(const Evas_Object *obj);
 
+/**
+ * Set the format function pointer for the units label
+ *
+ * @param obj The progress bar object
+ * @param func The unit format function
+ * @param free_func The freeing function for the format string.
+ *
+ * Set the callback function to format the unit string.
+ *
+ * @see elm_progressbar_unit_format_set() for more info on how this works.
+ *
+ * @since 1.1.0
+ *
+ * @ingroup Progressbar
+ */
+EAPI void                         elm_progressbar_unit_format_function_set(Evas_Object *obj, char *(func)(double), void (*free_func) (char *));
+
 /**
  * Set the orientation of a given progress bar widget
  *