--- a/src/ast_convert.rs
+++ b/src/ast_convert.rs
@@ -306,6 +306,7 @@ fn parse_expr(py: Python, ast: PyObject)
     let yield_from_type = ast_module.get(py, "YieldFrom").unwrap();
     let set_type = ast_module.get(py, "Set").unwrap();
     let setcomp_type = ast_module.get(py, "SetComp").unwrap();
+    let generatorexp_type = ast_module.get(py, "GeneratorExp").unwrap();
 
     assert!(is_instance(&ast, &ast_type));
 
@@ -435,6 +436,14 @@ fn parse_expr(py: Python, ast: PyObject)
         let generators = parse_list(py, generators, parse_comprehension);
 
         expr::SetComp(Box::new(elt), generators)
+    } else if is_instance(&ast, &generatorexp_type) {
+        let elt = ast.getattr(py, "elt").unwrap();
+        let generators = ast.getattr(py, "generators").unwrap();
+
+        let elt = parse_expr(py, elt);
+        let generators = parse_list(py, generators, parse_comprehension);
+
+        expr::GeneratorExp(Box::new(elt), generators)
     } else {
         println!("expr {}", ast);
         unreachable!()