diff --git a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
index 46c24f69c..b4553f8d2 100644
--- a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
+++ b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp
@@ -84,7 +84,11 @@ qulonglong SystemMemoryQuerier::availableMemoryBytes()
     while (!in.atEnd()) {
         QString line = in.readLine();
         if (line.startsWith("MemAvailable:")) {
-            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;
         }
diff --git a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.h b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.h
index 44fd9f6f9..8a15fecdd 100644
--- a/libcockatrice_utility/libcockatrice/utility/system_memory_querier.h
+++ b/libcockatrice_utility/libcockatrice/utility/system_memory_querier.h
@@ -11,8 +11,14 @@ public:
 
     static bool hasAtLeastGiB(int gib)
     {
+        const qulonglong total = totalMemoryBytes();
+        // 0 means the amount could not be determined (unsupported platform or failed query).
+        // Treat it as unknown and skip the check instead of misreading it as low memory.
+        if (total == 0) {
+            return true;
+        }
         const qulonglong GiB = 1024ull * 1024ull * 1024ull;
-        return totalMemoryBytes() >= (qulonglong)gib * GiB;
+        return total >= (qulonglong)gib * GiB;
     }
 };