diff --git a/src/net.cpp b/src/net.cpp
index 6b8a0a2b1e1..0511256e55b 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -448,6 +448,7 @@ CCriticalSection CNode::cs_setBanned;
 
 void CNode::ClearBanned()
 {
+    LOCK(cs_setBanned);
     setBanned.clear();
 }