diff --git a/src/test/ui/consts/issue-79690.rs b/src/test/ui/consts/issue-79690.rs
index 6a38b3c8c2c..a2e7b97b318 100644
--- a/src/test/ui/consts/issue-79690.rs
+++ b/src/test/ui/consts/issue-79690.rs
@@ -1,3 +1,6 @@
+// ignore-32bit
+// This test gives a different error on 32-bit architectures.
+
 union Transmute<T: Copy, U: Copy> {
     t: T,
     u: U,
diff --git a/src/test/ui/consts/issue-79690.stderr b/src/test/ui/consts/issue-79690.stderr
index c7f9c6a55e7..918dd4c20f9 100644
--- a/src/test/ui/consts/issue-79690.stderr
+++ b/src/test/ui/consts/issue-79690.stderr
@@ -1,5 +1,5 @@
 error[E0080]: it is undefined behavior to use this value
-  --> $DIR/issue-79690.rs:26:1
+  --> $DIR/issue-79690.rs:29:1
    |
 LL | const G: Fat = unsafe { Transmute { t: FOO }.u };
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered read of part of a pointer at .1.<deref>.size.foo