diff --git a/libqpdf/QPDF_optimization.cc b/libqpdf/QPDF_optimization.cc
index 2c8ec7e..65916c7 100644
--- a/libqpdf/QPDF_optimization.cc
+++ b/libqpdf/QPDF_optimization.cc
@@ -32,16 +32,17 @@ QPDF::ObjUser::ObjUser(user_e type, std::string const& key) :
 bool
 QPDF::ObjUser::operator<(ObjUser const& rhs) const
 {
-    if (this->ou_type < rhs.ou_type) {
+    if (ou_type < rhs.ou_type) {
         return true;
-    } else if (this->ou_type == rhs.ou_type) {
-        if (this->pageno < rhs.pageno) {
+    }
+    if (ou_type == rhs.ou_type) {
+        if (pageno < rhs.pageno) {
             return true;
-        } else if (this->pageno == rhs.pageno) {
-            return (this->key < rhs.key);
+        }
+        if (pageno == rhs.pageno) {
+            return key < rhs.key;
         }
     }
-
     return false;
 }