diff --git a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
index 9a4539256..46c24f69c 100644
--- a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
+++ b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
@@ -37,7 +37,11 @@ qulonglong SystemMemoryQuerier::totalMemoryBytes()
     while (!in.atEnd()) {
         QString line = in.readLine();
         if (line.startsWith("MemTotal:")) {
-            QStringList parts = line.split(QRegExp("\\s+"), Qt::SkipEmptyParts);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+            QStringList parts = line.split(QRegExp("\\s+"), QString::SkipEmptyParts);
+#else
+            QStringList parts = line.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
+#endif
             if (parts.size() >= 2)
                 return parts[1].toULongLong() * 1024; // kB → bytes
         }