diff --git a/Cargo.lock b/Cargo.lock
index ec542070a5d62..35d0f9e877123 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2367,7 +2367,6 @@ dependencies = [
  "clap",
  "countme",
  "insta",
- "is-macro",
  "itertools",
  "memchr",
  "once_cell",
diff --git a/crates/ruff_python_formatter/Cargo.toml b/crates/ruff_python_formatter/Cargo.toml
index 1aae33a9edc0b..8e7a3b55ad648 100644
--- a/crates/ruff_python_formatter/Cargo.toml
+++ b/crates/ruff_python_formatter/Cargo.toml
@@ -23,7 +23,6 @@ anyhow = { workspace = true }
 bitflags = { workspace = true }
 clap = { workspace = true }
 countme = "3.0.1"
-is-macro = { workspace = true }
 itertools = { workspace = true }
 memchr = { workspace = true }
 once_cell = { workspace = true }
diff --git a/crates/ruff_python_formatter/src/expression/mod.rs b/crates/ruff_python_formatter/src/expression/mod.rs
index 39af5b79e9e37..413b732a531ce 100644
--- a/crates/ruff_python_formatter/src/expression/mod.rs
+++ b/crates/ruff_python_formatter/src/expression/mod.rs
@@ -388,10 +388,10 @@ fn can_omit_optional_parentheses(expr: &Expr, context: &PyFormatContext) -> bool
         // Only use the layout if the first or last expression has parentheses of some sort, and
         // those parentheses are non-empty.
         let first_parenthesized = visitor.first.is_some_and(|first| {
-            has_parentheses(first, context).is_some_and(|parentheses| parentheses.is_non_empty())
+            has_parentheses(first, context).is_some_and(OwnParentheses::is_non_empty)
         });
         let last_parenthesized = visitor.last.is_some_and(|last| {
-            has_parentheses(last, context).is_some_and(|parentheses| parentheses.is_non_empty())
+            has_parentheses(last, context).is_some_and(OwnParentheses::is_non_empty)
         });
         first_parenthesized || last_parenthesized
     }
@@ -706,7 +706,7 @@ impl CallChainLayout {
     }
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq, is_macro::Is)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub(crate) enum OwnParentheses {
     /// The node has parentheses, but they are empty (e.g., `[]` or `f()`).
     Empty,
@@ -714,6 +714,12 @@ pub(crate) enum OwnParentheses {
     NonEmpty,
 }
 
+impl OwnParentheses {
+    const fn is_non_empty(self) -> bool {
+        matches!(self, OwnParentheses::NonEmpty)
+    }
+}
+
 /// Returns the [`OwnParentheses`] value for a given [`Expr`], to indicate whether it has its
 /// own parentheses or is itself parenthesized.
 ///