diff --git a/src/main.cpp b/src/main.cpp
index 7048dd2..026558a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -19,7 +19,7 @@
 
 int main(int argc, char* argv[])
 {
-    PostCodeDataHolder postcodeDataHolderObj =
+    PostCodeDataHolder& postcodeDataHolderObj =
         PostCodeDataHolder::getInstance();
 
     int arg;