diff --git a/include/MSICALib.h b/include/MSICALib.h
index fc66bf4..33709ef 100644
--- a/include/MSICALib.h
+++ b/include/MSICALib.h
@@ -95,6 +95,7 @@ class COperation
 {
 public:
     COperation(int iTicks = 0);
+    virtual ~COperation();
 
     virtual HRESULT Execute(CSession *pSession) = 0;
 
diff --git a/src/MSICALib.cpp b/src/MSICALib.cpp
index 580c7bf..141f80f 100644
--- a/src/MSICALib.cpp
+++ b/src/MSICALib.cpp
@@ -34,6 +34,10 @@ COperation::COperation(int iTicks) :
 {
 }
 
+COperation::~COperation()
+{
+}
+
 
 ////////////////////////////////////////////////////////////////////////////
 // COpTypeSingleString