diff --git a/enum.go b/enum.go
index dba1b52..38767af 100644
--- a/enum.go
+++ b/enum.go
@@ -29,6 +29,10 @@ func NewParsedSourceEnumHandler(srcdir string) (*ParsedSourceEnumHandler, error)
 	fset := token.NewFileSet()
 	pkgs := make(map[string]*ast.Package)
 	err := filepath.Walk(srcdir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
 		if !info.IsDir() {
 			return nil
 		}