diff --git a/src/core/CLucene/index/SDocumentWriter.h b/src/core/CLucene/index/SDocumentWriter.h
index 5d475a19df7..c46dec30392 100644
--- a/src/core/CLucene/index/SDocumentWriter.h
+++ b/src/core/CLucene/index/SDocumentWriter.h
@@ -816,7 +816,7 @@ class SDocumentsWriter : public IDocumentsWriter {
     const TermNumMapType &getBufferedDeleteTerms() override {_CLTHROW_NOT_IMPLEMENT}
     bool updateDocument(Term *t, CL_NS(document)::Document *doc, CL_NS(analysis)::Analyzer *analyzer) override {_CLTHROW_NOT_IMPLEMENT}
     bool bufferDeleteTerms(const CL_NS(util)::ArrayBase<Term *> *terms) override {_CLTHROW_NOT_IMPLEMENT}
-    int64_t getRAMUsed() override {_CLTHROW_NOT_IMPLEMENT}
+    int64_t getRAMUsed() override { return numBytesUsed; }
     const std::vector<int32_t> *getBufferedDeleteDocIDs() override {_CLTHROW_NOT_IMPLEMENT}
 
     bool hasProx() override;
@@ -854,4 +854,4 @@ class SDocumentsWriter : public IDocumentsWriter {
 #define CLUCENE_END_OF_WORD 0x0
 
 CL_NS_END
-#endif
\ No newline at end of file
+#endif