diff --git a/runtime/adainclude/unchecked_conversion.ads b/runtime/adainclude/unchecked_conversion.ads
index 0210a54..00e3d02 100644
--- a/runtime/adainclude/unchecked_conversion.ads
+++ b/runtime/adainclude/unchecked_conversion.ads
@@ -2,4 +2,4 @@ generic
    type Source (<>) is limited private;
    type Target (<>) is limited private;
 function Unchecked_Conversion (S : Source) return Target
-   with Pure, Nonblocking, Import, Convention => Intrinsic;
+   with Pure, Import, Convention => Intrinsic;