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-rw-r--r--ControlFlowGraph.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/ControlFlowGraph.cpp b/ControlFlowGraph.cpp
index 41a53aa8..5adb951a 100644
--- a/ControlFlowGraph.cpp
+++ b/ControlFlowGraph.cpp
@@ -34,7 +34,8 @@ using namespace std;
using namespace dev;
using namespace dev::eth;
-BlockId::BlockId(u256 const& _id): m_id(_id)
+BlockId::BlockId(u256 const& _id):
+ m_id(unsigned(_id))
{
assertThrow( _id < initial().m_id, OptimizerException, "Tag number too large.");
}