diff --git a/crates/uv/src/commands/project/add.rs b/crates/uv/src/commands/project/add.rs
index 0c1cf8d01cfd3..bdfe1c6dee0dd 100644
--- a/crates/uv/src/commands/project/add.rs
+++ b/crates/uv/src/commands/project/add.rs
@@ -104,7 +104,14 @@ pub(crate) async fn add(
             RequirementsSource::SetupCfg(_) => {
                 bail!("Adding requirements from a `setup.cfg` is not supported in `uv add`");
             }
-            _ => {}
+            RequirementsSource::PylockToml(_) => {
+                bail!("Adding requirements from a `pylock.toml` is not supported in `uv add`");
+            }
+            RequirementsSource::Package(_)
+            | RequirementsSource::Editable(_)
+            | RequirementsSource::RequirementsTxt(_)
+            | RequirementsSource::EnvironmentYml(_)
+            | RequirementsSource::SourceTree(_) => {}
         }
     }