diff --git a/logrotee.cpp b/logrotee.cpp
index 43369c6..96dcbb2 100644
--- a/logrotee.cpp
+++ b/logrotee.cpp
@@ -34,7 +34,7 @@ struct Arguments {
 	
 public:
 	Arguments(int argc, char *argv[])
-			: chunkSize(DEFAULT_CHUNK_SIZE)
+			: chunkSize(DEFAULT_CHUNK_SIZE), invalid(false)
 	{
 		int getoptResult;