diff --git a/FDTD/operator.cpp b/FDTD/operator.cpp
index 5d4c318..c129db7 100644
--- a/FDTD/operator.cpp
+++ b/FDTD/operator.cpp
@@ -1653,3 +1653,15 @@ void Operator::AddExtension(Operator_Extension* op_ext)
 {
 	m_Op_exts.push_back(op_ext);
 }
+
+void Operator::DeleteExtension(Operator_Extension* op_ext)
+{
+	for (size_t n=0;n<m_Op_exts.size();++n)
+	{
+		if (m_Op_exts.at(n)==op_ext)
+		{
+			m_Op_exts.erase(m_Op_exts.begin()+n);
+			return;
+		}
+	}
+}
diff --git a/FDTD/operator.h b/FDTD/operator.h
index 8d83810..da817eb 100644
--- a/FDTD/operator.h
+++ b/FDTD/operator.h
@@ -127,6 +127,7 @@ public:
 	virtual int SnapBox2Mesh(const double* start, const double* stop, unsigned int* uiStart, unsigned int* uiStop, bool dualMesh=false, int SnapMethod=0, bool* bStartIn=NULL, bool* bStopIn=NULL) const;
 
 	virtual void AddExtension(Operator_Extension* op_ext);
+	virtual void DeleteExtension(Operator_Extension* op_ext);
 	virtual size_t GetNumberOfExtentions() const {return m_Op_exts.size();}
 	virtual Operator_Extension* GetExtension(size_t index) const {return m_Op_exts.at(index);}