diff --git a/legacy/ecore/src/lib/ecore/Ecore_Data.h b/legacy/ecore/src/lib/ecore/Ecore_Data.h
index 4118bde7b4..cb981428b3 100644
--- a/legacy/ecore/src/lib/ecore/Ecore_Data.h
+++ b/legacy/ecore/src/lib/ecore/Ecore_Data.h
@@ -355,7 +355,7 @@ extern "C" {
    
    EAPI int ecore_string_init(void);
    EAPI void ecore_string_shutdown(void);
-   EAPI const char *ecore_string_instance(char *string);
+   EAPI const char *ecore_string_instance(const char *string);
    EAPI void ecore_string_release(const char *string);
    
    
diff --git a/legacy/ecore/src/lib/ecore/ecore_strings.c b/legacy/ecore/src/lib/ecore/ecore_strings.c
index 7a0999c9f2..79f186b3ab 100644
--- a/legacy/ecore/src/lib/ecore/ecore_strings.c
+++ b/legacy/ecore/src/lib/ecore/ecore_strings.c
@@ -44,7 +44,7 @@ ecore_string_init()
  * @ingroup Ecore_String_Group
  */
 EAPI const char *
-ecore_string_instance(char *string)
+ecore_string_instance(const char *string)
 {
    Ecore_String *str;