1 files changed, 3 insertions, 2 deletions
diff --git a/src/ui_interface.h b/src/ui_interface.h
index 065d23fbb4..762dd19b19 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -12,9 +12,7 @@
 #include <boost/signals2/last_value.hpp>
 #include <boost/signals2/signal.hpp>
 
-class CBasicKeyStore;
 class CWallet;
-class uint256;
 class CBlockIndex;
 
 /** General change type (added, updated, removed). */
@@ -99,6 +97,9 @@ public:
     /** Show progress e.g. for verifychain */
     boost::signals2::signal<void (const std::string &title, int nProgress)> ShowProgress;
 
+    /** Set progress break action (possible "cancel button" triggers that action) */
+    boost::signals2::signal<void (std::function<void(void)> action)> SetProgressBreakAction;
+
     /** New block has been accepted */
     boost::signals2::signal<void (bool, const CBlockIndex *)> NotifyBlockTip;