diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c
index 982274c6d77..535f4ca7fba 100644
--- a/gcc/ada/gcc-interface/utils.c
+++ b/gcc/ada/gcc-interface/utils.c
@@ -3543,9 +3543,6 @@ finish_subprog_decl (tree decl, tree asm_name, tree type)
   DECL_BY_REFERENCE (result_decl) = TREE_ADDRESSABLE (type);
   DECL_RESULT (decl) = result_decl;
 
-  /* Propagate the "const" property.  */
-  TREE_READONLY (decl) = TYPE_READONLY (type);
-
   /* Propagate the "pure" property.  */
   DECL_PURE_P (decl) = TYPE_RESTRICT (type);