diff --git a/src/tools/rustfmt/src/macros.rs b/src/tools/rustfmt/src/macros.rs
index e4c05d58004a7..8bfd99f2f7c9f 100644
--- a/src/tools/rustfmt/src/macros.rs
+++ b/src/tools/rustfmt/src/macros.rs
@@ -454,7 +454,7 @@ pub(crate) fn rewrite_macro_def(
     };
 
     let mut header = if def.macro_rules {
-        let pos = context.snippet_provider.span_after(span, "macro_rules!");
+        let pos = context.snippet_provider.span_after(span, "!");
         vec![HeaderPart::new("macro_rules!", span.with_hi(pos))]
     } else {
         let macro_lo = context.snippet_provider.span_before(span, "macro");