diff --git a/src/libsync/discoveryphase.h b/src/libsync/discoveryphase.h
index da121b5f1d..832c5265a6 100644
--- a/src/libsync/discoveryphase.h
+++ b/src/libsync/discoveryphase.h
@@ -105,9 +105,9 @@ class DiscoveryMainThread : public QObject {
     qint64 *_currentGetSizeResult;
 
 public:
-    DiscoveryMainThread(AccountPtr account) : QObject(), _account(account), _currentDiscoveryDirectoryResult(0) {
-
-    }
+    DiscoveryMainThread(AccountPtr account) : QObject(), _account(account),
+        _currentDiscoveryDirectoryResult(0), _currentGetSizeResult(0)
+    { }
     void abort();