diff --git a/src/qdoc/main.cpp b/src/qdoc/main.cpp
index c85ddb44de142fffb7b57b76e9c74eff0b84d5ac..e2ae550c1579e6147f8f9d78f045db791c9c3915 100644
--- a/src/qdoc/main.cpp
+++ b/src/qdoc/main.cpp
@@ -169,8 +169,9 @@ static void loadIndexFiles(Config &config, const QSet<QString> &formats)
                         highest UNIX timestamp.
                     */
                     QStringList indexPaths;
-                    for (int k = 0; k < foundIndices.size(); k++)
-                        indexPaths << foundIndices[k].absoluteFilePath();
+                    indexPaths.reserve(foundIndices.size());
+                    for (const auto &found : qAsConst(foundIndices))
+                        indexPaths << found.absoluteFilePath();
                     Location::null.warning(QString("Multiple index files found for dependency \"%1\":\n%2").arg(
                                                qdocGlobals.dependModules()[i], indexPaths.join('\n')));
                     Location::null.warning(QString("Using %1 as index file for dependency \"%2\"").arg(