diff --git a/training/cntraining.cpp b/training/cntraining.cpp
index 5af05a62..ab19ddb9 100644
--- a/training/cntraining.cpp
+++ b/training/cntraining.cpp
@@ -167,6 +167,8 @@ int main(int  argc, char* argv[])
   pCharList = CharList;
   iterate(pCharList) {
     //Cluster
+    if (Clusterer)
+       FreeClusterer(Clusterer);
     CharSample = (LABELEDLIST)first_node(pCharList);
     Clusterer =
       SetUpForClustering(FeatureDefs, CharSample, PROGRAM_FEATURE_TYPE);