diff --git a/crates/nu-cli/tests/commands/mod.rs b/crates/nu-cli/tests/commands/mod.rs
new file mode 100644
index 0000000000..00488f0b9e
--- /dev/null
+++ b/crates/nu-cli/tests/commands/mod.rs
@@ -0,0 +1 @@
+mod nu_highlight;
diff --git a/crates/nu-cli/tests/commands/nu_highlight.rs b/crates/nu-cli/tests/commands/nu_highlight.rs
new file mode 100644
index 0000000000..bd185a8634
--- /dev/null
+++ b/crates/nu-cli/tests/commands/nu_highlight.rs
@@ -0,0 +1,7 @@
+use nu_test_support::nu;
+
+#[test]
+fn nu_highlight_not_expr() {
+    let actual = nu!("'not false' | nu-highlight | ansi strip");
+    assert_eq!(actual.out, "not false");
+}
diff --git a/crates/nu-cli/tests/completions.rs b/crates/nu-cli/tests/completions/mod.rs
similarity index 100%
rename from crates/nu-cli/tests/completions.rs
rename to crates/nu-cli/tests/completions/mod.rs
diff --git a/crates/nu-cli/tests/support/completions_helpers.rs b/crates/nu-cli/tests/completions/support/completions_helpers.rs
similarity index 100%
rename from crates/nu-cli/tests/support/completions_helpers.rs
rename to crates/nu-cli/tests/completions/support/completions_helpers.rs
diff --git a/crates/nu-cli/tests/support/mod.rs b/crates/nu-cli/tests/completions/support/mod.rs
similarity index 100%
rename from crates/nu-cli/tests/support/mod.rs
rename to crates/nu-cli/tests/completions/support/mod.rs
diff --git a/crates/nu-cli/tests/main.rs b/crates/nu-cli/tests/main.rs
new file mode 100644
index 0000000000..a040a731f3
--- /dev/null
+++ b/crates/nu-cli/tests/main.rs
@@ -0,0 +1,2 @@
+mod commands;
+mod completions;
diff --git a/crates/nu-parser/src/flatten.rs b/crates/nu-parser/src/flatten.rs
index e70a48e9f1..92b424783a 100644
--- a/crates/nu-parser/src/flatten.rs
+++ b/crates/nu-parser/src/flatten.rs
@@ -180,12 +180,12 @@ fn flatten_expression_into(
             flatten_expression_into(working_set, op, output);
             flatten_expression_into(working_set, rhs, output);
         }
-        Expr::UnaryNot(expr) => {
+        Expr::UnaryNot(not) => {
             output.push((
                 Span::new(expr.span.start, expr.span.start + 3),
                 FlatShape::Operator,
             ));
-            flatten_expression_into(working_set, expr, output);
+            flatten_expression_into(working_set, not, output);
         }
         Expr::Closure(block_id) => {
             let outer_span = expr.span;