diff --git a/src/gui/src/CoreInterface.cpp b/src/gui/src/CoreInterface.cpp
index d537a24f..b06a5d90 100644
--- a/src/gui/src/CoreInterface.cpp
+++ b/src/gui/src/CoreInterface.cpp
@@ -22,10 +22,18 @@
 
 #include <QCoreApplication>
 #include <QProcess>
+#include <QtGlobal>
+#include <QDir>
 #include <stdexcept>
 
 static const char kCoreBinary[] = "syntool";
 
+#ifdef Q_WS_WIN
+static const char kSerialKeyFilename[] = "Synergy.subkey";
+#else
+static const char kSerialKeyFilename[] = ".synergy.subkey";
+#endif
+
 CoreInterface::CoreInterface()
 {
 }
@@ -54,10 +62,10 @@ QString CoreInterface::getArch()
 	return run(args);
 }
 
-QString CoreInterface::getSubscriptionFilename()
+QString CoreInterface::getSerialKeyFilePath()
 {
-	QStringList args("--get-subscription-filename");
-	return run(args);
+	QString filename = getProfileDir() + QDir::separator() + kSerialKeyFilename;
+	return filename;
 }
 
 QString CoreInterface::activateSerial(const QString& serial)
diff --git a/src/gui/src/CoreInterface.h b/src/gui/src/CoreInterface.h
index 13e8fd87..cd61ae25 100644
--- a/src/gui/src/CoreInterface.h
+++ b/src/gui/src/CoreInterface.h
@@ -28,7 +28,7 @@ public:
 	QString getProfileDir();
 	QString getInstalledDir();
 	QString getArch();
-	QString getSubscriptionFilename();
+	QString getSerialKeyFilePath();
 	QString activateSerial(const QString& serial);
 	QString checkSubscription();
 	QString notifyActivation(const QString& identity);
diff --git a/src/gui/src/SubscriptionManager.cpp b/src/gui/src/SubscriptionManager.cpp
index 77e0a91c..cc842be3 100644
--- a/src/gui/src/SubscriptionManager.cpp
+++ b/src/gui/src/SubscriptionManager.cpp
@@ -85,9 +85,9 @@ bool SubscriptionManager::checkSubscription()
 bool SubscriptionManager::fileExists()
 {
 	CoreInterface coreInterface;
-	QString subscriptionFilename = coreInterface.getSubscriptionFilename();
+	QString serialKeyFilePath = coreInterface.getSerialKeyFilePath();
 
-	return QFile::exists(subscriptionFilename);
+	return QFile::exists(serialKeyFilePath);
 }
 
 void SubscriptionManager::checkError(QString& error)