diff --git a/libdevcore/Common.cpp b/libdevcore/Common.cpp
index b6e8e7f93..78b3d9c30 100644
--- a/libdevcore/Common.cpp
+++ b/libdevcore/Common.cpp
@@ -27,7 +27,7 @@ using namespace dev;
 namespace dev
 {
 
-char const* Version = "0.9.7";
+char const* Version = "0.9.8";
 
 }
 
diff --git a/libethereum/Client.cpp b/libethereum/Client.cpp
index ea8efd310..4f9af91a9 100644
--- a/libethereum/Client.cpp
+++ b/libethereum/Client.cpp
@@ -332,7 +332,8 @@ void Client::appendFromNewBlock(h256 const& _block, h256Set& io_changed)
 void Client::setForceMining(bool _enable)
 {
 	 m_forceMining = _enable;
-	 startMining();
+	 if (isMining())
+		startMining();
 }
 
 MiningProgress Client::miningProgress() const