diff --git a/crates/mbe/src/benchmark.rs b/crates/mbe/src/benchmark.rs
index f73e188c79..19ba5c7a15 100644
--- a/crates/mbe/src/benchmark.rs
+++ b/crates/mbe/src/benchmark.rs
@@ -215,7 +215,7 @@ fn invocation_fixtures(
 
                 token_trees.push(subtree.into());
             }
-            Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Length { .. } => {}
+            Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Len { .. } => {}
         };
 
         // Simple linear congruential generator for deterministic result
diff --git a/crates/mbe/src/expander/matcher.rs b/crates/mbe/src/expander/matcher.rs
index 78d4bfee2a..0cec4e70da 100644
--- a/crates/mbe/src/expander/matcher.rs
+++ b/crates/mbe/src/expander/matcher.rs
@@ -566,7 +566,7 @@ fn match_loop_inner<'t>(
                 error_items.push(item);
             }
             OpDelimited::Op(
-                Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Length { .. },
+                Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Len { .. },
             ) => {
                 stdx::never!("metavariable expression in lhs found");
             }
@@ -832,7 +832,7 @@ fn collect_vars(collector_fun: &mut impl FnMut(SmolStr), pattern: &MetaTemplate)
             Op::Subtree { tokens, .. } => collect_vars(collector_fun, tokens),
             Op::Repeat { tokens, .. } => collect_vars(collector_fun, tokens),
             Op::Literal(_) | Op::Ident(_) | Op::Punct(_) => {}
-            Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Length { .. } => {
+            Op::Ignore { .. } | Op::Index { .. } | Op::Count { .. } | Op::Len { .. } => {
                 stdx::never!("metavariable expression in lhs found");
             }
         }
diff --git a/crates/mbe/src/expander/transcriber.rs b/crates/mbe/src/expander/transcriber.rs
index 5e6e45f152..0f689a2692 100644
--- a/crates/mbe/src/expander/transcriber.rs
+++ b/crates/mbe/src/expander/transcriber.rs
@@ -242,7 +242,7 @@ fn expand_subtree(
                     .into(),
                 );
             }
-            Op::Length { depth } => {
+            Op::Len { depth } => {
                 let length = ctx.nesting.get(ctx.nesting.len() - 1 - depth).map_or(0, |_nest| {
                     // FIXME: to be implemented
                     0
diff --git a/crates/mbe/src/parser.rs b/crates/mbe/src/parser.rs
index eaf2fd8c27..bbe00f0afc 100644
--- a/crates/mbe/src/parser.rs
+++ b/crates/mbe/src/parser.rs
@@ -75,7 +75,7 @@ pub(crate) enum Op {
     Index {
         depth: usize,
     },
-    Length {
+    Len {
         depth: usize,
     },
     Count {
@@ -345,7 +345,7 @@ fn parse_metavar_expr(new_meta_vars: bool, src: &mut TtIter<'_, Span>) -> Result
             Op::Ignore { name: ident.text.clone(), id: ident.span }
         }
         "index" => Op::Index { depth: parse_depth(&mut args)? },
-        "length" => Op::Length { depth: parse_depth(&mut args)? },
+        "len" => Op::Len { depth: parse_depth(&mut args)? },
         "count" => {
             if new_meta_vars {
                 args.expect_dollar()?;