diff --git a/main.cpp b/main.cpp
index 1225718..d335b8a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -413,7 +413,7 @@ void main_classic(std::string infile, std::string outfile, int num_generations,
     }
 
     result_file.close();
-    delete neighbor_counts;
+    delete[] neighbor_counts;
 
     timing->stopFinalization();
 }