diff --git a/sample/sample.cpp b/sample/sample.cpp
index 0797e96..2edf3bd 100644
--- a/sample/sample.cpp
+++ b/sample/sample.cpp
@@ -11,7 +11,6 @@ using namespace mdlp;
 int main(int argc, char** argv)
 {
     ArffFiles file;
-    vector<string> lines;
     string path = "../../tests/datasets/";
     map<string, bool> datasets = {
             {"mfeat-factors",      true},