diff --git a/sw/source/core/doc/doccomp.cxx b/sw/source/core/doc/doccomp.cxx
index 1da77046d5cf..80c77c4e4781 100644
--- a/sw/source/core/doc/doccomp.cxx
+++ b/sw/source/core/doc/doccomp.cxx
@@ -200,6 +200,7 @@ public:
     virtual bool Compare( int nIdx1, int nIdx2 ) const = 0;
     virtual int GetLen1() const = 0;
     virtual int GetLen2() const = 0;
+    virtual ~ArrayComparator() {}
 };
 
 // Consider two lines equal if similar enough (e.g. look like different