diff --git a/src/lib/ip/OCIONodes/OCIOIPNode.cpp b/src/lib/ip/OCIONodes/OCIOIPNode.cpp
index 9bec40648..4ed5c058c 100644
--- a/src/lib/ip/OCIONodes/OCIOIPNode.cpp
+++ b/src/lib/ip/OCIONodes/OCIOIPNode.cpp
@@ -82,7 +82,8 @@ OCIOIPNode::OCIOIPNode(const string& name,
                        IPGraph* graph,
                        GroupIPNode* group)
     : IPNode(name, def, graph, group),
-      m_useRawConfig(false)
+      m_useRawConfig(false),
+      m_lock(QMutex::Recursive)
 {
     Property::Info* info = new Property::Info();
     info->setPersistent(false);