diff --git a/src/plugins/dummy/dummybackend.cpp b/src/plugins/dummy/dummybackend.cpp
index 2e955b9..43d1011 100644
--- a/src/plugins/dummy/dummybackend.cpp
+++ b/src/plugins/dummy/dummybackend.cpp
@@ -70,6 +70,13 @@ Device* DummyBackend::scanDevice(const QString& device_node)
     return d;
 }
 
+FileSystem::Type DummyBackend::detectFileSystem(const QString& deviceNode)
+{
+    Q_UNUSED(deviceNode)
+
+    return FileSystem::Unknown;
+}
+
 CoreBackendDevice* DummyBackend::openDevice(const QString& device_node)
 {
     DummyDevice* device = new DummyDevice(device_node);
diff --git a/src/plugins/dummy/dummybackend.h b/src/plugins/dummy/dummybackend.h
index 20e63e4..9b374cc 100644
--- a/src/plugins/dummy/dummybackend.h
+++ b/src/plugins/dummy/dummybackend.h
@@ -49,7 +49,7 @@ public:
     virtual CoreBackendDevice* openDeviceExclusive(const QString& device_node) override;
     virtual bool closeDevice(CoreBackendDevice* core_device) override;
     virtual Device* scanDevice(const QString& device_node) override;
-    virtual FileSystem::Type detectFileSystem(const QString& deviceNode) override {return FileSystem::Unknown;}
+    virtual FileSystem::Type detectFileSystem(const QString& deviceNode) override;
 };
 
 #endif