diff --git a/crates/distribution-types/src/specified_requirement.rs b/crates/distribution-types/src/specified_requirement.rs
index 0a2867c50..b7baba012 100644
--- a/crates/distribution-types/src/specified_requirement.rs
+++ b/crates/distribution-types/src/specified_requirement.rs
@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::fmt::{Display, Formatter};
 
 use pep508_rs::{MarkerEnvironment, UnnamedRequirement};
@@ -58,16 +59,16 @@ impl UnresolvedRequirement {
     }
 
     /// Return the version specifier or URL for the requirement.
-    pub fn source(&self) -> Result<RequirementSource, ParsedUrlError> {
+    pub fn source(&self) -> Result<Cow<'_, RequirementSource>, ParsedUrlError> {
         // TODO(konsti): This is a bad place to raise errors, we should have parsed the url earlier.
         match self {
-            Self::Named(requirement) => Ok(requirement.source.clone()),
+            Self::Named(requirement) => Ok(Cow::Borrowed(&requirement.source)),
             Self::Unnamed(requirement) => {
                 let parsed_url = ParsedUrl::try_from(requirement.url.to_url())?;
-                Ok(RequirementSource::from_parsed_url(
+                Ok(Cow::Owned(RequirementSource::from_parsed_url(
                     parsed_url,
                     requirement.url.clone(),
-                ))
+                )))
             }
         }
     }
diff --git a/crates/uv-installer/src/site_packages.rs b/crates/uv-installer/src/site_packages.rs
index 6742b6463..2acb8154a 100644
--- a/crates/uv-installer/src/site_packages.rs
+++ b/crates/uv-installer/src/site_packages.rs
@@ -365,7 +365,7 @@ impl<'a> SitePackages<'a> {
                 [distribution] => {
                     match RequirementSatisfaction::check(
                         distribution,
-                        &entry.requirement.source()?,
+                        entry.requirement.source()?.as_ref(),
                     )? {
                         RequirementSatisfaction::Mismatch | RequirementSatisfaction::OutOfDate => {
                             return Ok(SatisfiesResult::Unsatisfied(entry.requirement.to_string()))