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-rw-r--r--compiler/rustc_parse_format/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index 5b8a2fe52d3..97931742985 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -1105,7 +1105,7 @@ fn unescape_string(string: &str) -> Option<String> {
 }
 
 // Assert a reasonable size for `Piece`
-#[cfg(target_pointer_width = "64")]
+#[cfg(all(test, target_pointer_width = "64"))]
 rustc_index::static_assert_size!(Piece<'_>, 16);
 
 #[cfg(test)]