diff --git a/tests/fail/unaligned_pointers/dyn_alignment.stderr b/tests/fail/unaligned_pointers/dyn_alignment.stderr
index 05e30f833b..14eb372c2a 100644
--- a/tests/fail/unaligned_pointers/dyn_alignment.stderr
+++ b/tests/fail/unaligned_pointers/dyn_alignment.stderr
@@ -1,8 +1,8 @@
-error: Undefined Behavior: constructing invalid value: encountered an unaligned reference (required ALIGN byte alignment but found ALIGN)
+error: Undefined Behavior: constructing invalid value: encountered an unaligned reference (required 256 byte alignment but found $ALIGN)
   --> $DIR/dyn_alignment.rs:LL:CC
    |
 LL |         let _ptr = &*ptr;
-   |                    ^^^^^ constructing invalid value: encountered an unaligned reference (required ALIGN byte alignment but found ALIGN)
+   |                    ^^^^^ constructing invalid value: encountered an unaligned reference (required 256 byte alignment but found $ALIGN)
    |
    = 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