diff --git a/Cargo.toml b/Cargo.toml
index 819f417c14..4bda1245b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -134,6 +134,7 @@ testutils = { path = "lib/testutils" }
 
 [workspace.lints.clippy]
 explicit_iter_loop = "deny"
+flat_map_option = "deny"
 implicit_clone = "deny"
 redundant_else = "deny"
 semicolon_if_nothing_returned = "deny"
diff --git a/lib/src/fileset.rs b/lib/src/fileset.rs
index dae932a6f9..18b78ad288 100644
--- a/lib/src/fileset.rs
+++ b/lib/src/fileset.rs
@@ -297,7 +297,7 @@ impl FilesetExpression {
     pub fn explicit_paths(&self) -> impl Iterator<Item = &RepoPath> {
         // pre/post-ordering doesn't matter so long as children are visited from
         // left to right.
-        self.dfs_pre().flat_map(|expr| match expr {
+        self.dfs_pre().filter_map(|expr| match expr {
             FilesetExpression::Pattern(pattern) => pattern.as_path(),
             _ => None,
         })