diff --git a/src/lib/eo/eo_base.eo b/src/lib/eo/eo_base.eo
index 29a1531bc9..2dfd6abc99 100644
--- a/src/lib/eo/eo_base.eo
+++ b/src/lib/eo/eo_base.eo
@@ -140,7 +140,7 @@ abstract Eo.Base ()
             @in data: const(void)*; [[the data to set]]
          }
       }
-      key_data_get {
+      key_data_get @const {
          [[Get generic data from object.]]
          params {
             @in key: const(char)*; [[the key associated with the data]]
diff --git a/src/lib/eo/eo_base_class.c b/src/lib/eo/eo_base_class.c
index 065c77eae8..665f684af4 100644
--- a/src/lib/eo/eo_base_class.c
+++ b/src/lib/eo/eo_base_class.c
@@ -77,7 +77,7 @@ _eo_base_key_data_set(Eo *obj, Eo_Base_Data *pd,
 }
 
 EOLIAN static void *
-_eo_base_key_data_get(Eo *obj EINA_UNUSED, Eo_Base_Data *pd, const char *key)
+_eo_base_key_data_get(const Eo *obj EINA_UNUSED, Eo_Base_Data *pd, const char *key)
 {
    /* We don't really change it... */
    Eo_Generic_Data_Node *node;