Fix missingOverride

diff --git a/util/ng_corpus_generator.cpp b/util/ng_corpus_generator.cpp
index 68aa55836bc791c960af655e07ebef990e08b0f1..c18f2398119156df8b7ae653ae94a54eb510b434 100644 (file)
--- a/util/ng_corpus_generator.cpp
+++ b/util/ng_corpus_generator.cpp
@@ -221,7 +221,7 @@ class CorpusGeneratorImpl : public CorpusGenerator {
 public:
     CorpusGeneratorImpl(const NGHolder &graph_in, const ExpressionInfo &expr_in,
                         CorpusProperties &props);
-    ~CorpusGeneratorImpl() = default;
+    virtual ~CorpusGeneratorImpl() = default;
 
     void generateCorpus(vector<string> &data) override;