diff --git a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
index 7d481940ace..35de4535222 100644
--- a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
+++ b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_callee_ret.stderr
@@ -1,8 +1,8 @@
-error: Undefined Behavior: constructing invalid value: encountered 0, but expected something greater or equal to 1
+error: Undefined Behavior: constructing invalid value at .0: encountered 0, but expected something greater or equal to 1
   --> $DIR/cast_fn_ptr_invalid_callee_ret.rs:LL:CC
    |
 LL |     f();
-   |     ^^^ constructing invalid value: encountered 0, but expected something greater or equal to 1
+   |     ^^^ constructing invalid value at .0: encountered 0, but expected something greater or equal to 1
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
diff --git a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_arg.stderr b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_arg.stderr
index b1a2bd2c79a..81d775f6d7f 100644
--- a/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_arg.stderr
+++ b/src/tools/miri/tests/fail/validity/cast_fn_ptr_invalid_caller_arg.stderr
@@ -1,8 +1,8 @@
-error: Undefined Behavior: constructing invalid value: encountered 0, but expected something greater or equal to 1
+error: Undefined Behavior: constructing invalid value at .0: encountered 0, but expected something greater or equal to 1
   --> $DIR/cast_fn_ptr_invalid_caller_arg.rs:LL:CC
    |
 LL |             Call(_res = f(*ptr), ReturnTo(retblock), UnwindContinue())
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered 0, but expected something greater or equal to 1
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered 0, but expected something greater or equal to 1
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information