diff --git a/demo/bow.cpp b/demo/bow.cpp
index ecb7e91..dcd3d69 100644
--- a/demo/bow.cpp
+++ b/demo/bow.cpp
@@ -10,6 +10,7 @@ int main(int argc, char **argv) {
 
     double time = omp_get_wtime() - start_time;
     printf("rows:%d cols:%d time:%f\n",featureMatrix->nFeaturesVectors,featureMatrix->featureVector[0]->size, time);
+    destroyFeatureMatrix(&featureMatrix);
     destroyDirectoryManager(&directoryManager);
     return 0;
 }