diff --git a/crates/uv-python/src/downloads.rs b/crates/uv-python/src/downloads.rs
index 6e6e32b81..b7f88c073 100644
--- a/crates/uv-python/src/downloads.rs
+++ b/crates/uv-python/src/downloads.rs
@@ -405,7 +405,10 @@ impl PythonDownloadRequest {
     ///
     /// Platform information is pulled from the environment.
     pub fn fill_platform(mut self) -> Result<Self, Error> {
-        let platform = Platform::from_env()?;
+        let platform = Platform::from_env().map_err(|err| match err {
+            platform::Error::LibcDetectionError(err) => Error::LibcDetection(err),
+            err => Error::InvalidRequestPlatform(err),
+        })?;
         if self.arch.is_none() {
             self.arch = Some(ArchRequest::Environment(platform.arch));
         }