diff --git a/utils/cluster_struc.cpp b/utils/cluster_struc.cpp
index b64467a..5f727db 100644
--- a/utils/cluster_struc.cpp
+++ b/utils/cluster_struc.cpp
@@ -173,7 +173,7 @@ int main(int argc, char *argv[]) {
         for (int i = 0; i < nrstruc; i++) {
           delete[] neighbor[i];
         }
-        delete[] neighbor, neighborcount;
+        delete[] neighbor, delete[] neighborcount;
         return 5;
       }
       if (rmsd < cutoff) {