diff --git a/std/experimental/checkedint.d b/std/experimental/checkedint.d
index 2fe5301ec..3c5ca28a4 100644
--- a/std/experimental/checkedint.d
+++ b/std/experimental/checkedint.d
@@ -2618,7 +2618,7 @@ if (isIntegral!T && T.sizeof >= 4)
     testPow!ulong(3, 41);
 }
 
-version(unittest) private struct CountOverflows
+version(StdUnittest) private struct CountOverflows
 {
     uint calls;
     auto onOverflow(string op, Lhs)(Lhs lhs)
@@ -2643,7 +2643,7 @@ version(unittest) private struct CountOverflows
     }
 }
 
-version(unittest) private struct CountOpBinary
+version(StdUnittest) private struct CountOpBinary
 {
     uint calls;
     auto hookOpBinary(string op, Lhs, Rhs)(Lhs lhs, Rhs rhs)