diff --git a/src/ast/checks.rs b/src/ast/checks.rs
index d57622c5bd..503a6477f0 100644
--- a/src/ast/checks.rs
+++ b/src/ast/checks.rs
@@ -93,10 +93,11 @@ pub fn check_do_not_assign_lambda(value: &Expr, location: Location) -> Option<Ch
     }
 }
 
-pub fn is_ambiguous_name(name: &str) -> bool {
+fn is_ambiguous_name(name: &str) -> bool {
     name == "l" || name == "I" || name == "O"
 }
 
+/// Check AmbiguousVariableName compliance.
 pub fn check_ambiguous_variable_name(name: &str, location: Location) -> Option<Check> {
     if is_ambiguous_name(name) {
         Some(Check::new(
diff --git a/src/check_ast.rs b/src/check_ast.rs
index 7e821b2d36..d9b0a221d0 100644
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -965,11 +965,10 @@ impl<'a> Checker<'a> {
                 }
             }
 
-            if self.settings.select.contains(&CheckCode::E741) && checks::is_ambiguous_name(id) {
-                self.checks.push(Check::new(
-                    CheckKind::AmbiguousVariableName(id.to_string()),
-                    expr.location,
-                ));
+            if self.settings.select.contains(&CheckCode::E741) {
+                if let Some(check) = checks::check_ambiguous_variable_name(id, expr.location) {
+                    self.checks.push(check);
+                }
             }
 
             // TODO(charlie): Handle alternate binding types (like `Annotation`).