diff --git a/crates/uv-resolver/src/lock/installable.rs b/crates/uv-resolver/src/lock/installable.rs
index 9b2c1eb74..44136b003 100644
--- a/crates/uv-resolver/src/lock/installable.rs
+++ b/crates/uv-resolver/src/lock/installable.rs
@@ -1,4 +1,3 @@
-use std::borrow::Cow;
 use std::collections::hash_map::Entry;
 use std::collections::BTreeSet;
 use std::collections::VecDeque;
@@ -320,17 +319,13 @@ pub trait Installable<'lock> {
                             additional_activated_extras.push(key);
                         }
                     }
-                    let temp_activated_extras = if additional_activated_extras.is_empty() {
-                        Cow::Borrowed(&activated_extras)
-                    } else {
-                        let mut owned = activated_extras.clone();
-                        owned.extend_from_slice(&additional_activated_extras);
-                        Cow::Owned(owned)
-                    };
                     if !dep.complexified_marker.evaluate(
                         marker_env,
-                        &temp_activated_extras,
-                        &activated_groups,
+                        activated_extras
+                            .iter()
+                            .chain(additional_activated_extras.iter())
+                            .copied(),
+                        activated_groups.iter().copied(),
                     ) {
                         continue;
                     }
@@ -413,8 +408,8 @@ pub trait Installable<'lock> {
             for dep in deps {
                 if !dep.complexified_marker.evaluate(
                     marker_env,
-                    &activated_extras,
-                    &activated_groups,
+                    activated_extras.iter().copied(),
+                    activated_groups.iter().copied(),
                 ) {
                     continue;
                 }
diff --git a/crates/uv-resolver/src/universal_marker.rs b/crates/uv-resolver/src/universal_marker.rs
index e147720a3..973e0442a 100644
--- a/crates/uv-resolver/src/universal_marker.rs
+++ b/crates/uv-resolver/src/universal_marker.rs
@@ -245,20 +245,18 @@ impl UniversalMarker {
     pub(crate) fn evaluate<P, E, G>(
         self,
         env: &MarkerEnvironment,
-        extras: &[(P, E)],
-        groups: &[(P, G)],
+        extras: impl Iterator<Item = (P, E)>,
+        groups: impl Iterator<Item = (P, G)>,
     ) -> bool
     where
         P: Borrow<PackageName>,
         E: Borrow<ExtraName>,
         G: Borrow<GroupName>,
     {
-        let extras = extras
-            .iter()
-            .map(|(package, extra)| encode_package_extra(package.borrow(), extra.borrow()));
-        let groups = groups
-            .iter()
-            .map(|(package, group)| encode_package_group(package.borrow(), group.borrow()));
+        let extras =
+            extras.map(|(package, extra)| encode_package_extra(package.borrow(), extra.borrow()));
+        let groups =
+            groups.map(|(package, group)| encode_package_group(package.borrow(), group.borrow()));
         self.marker
             .evaluate(env, &extras.chain(groups).collect::<Vec<ExtraName>>())
     }