1 files changed, 1 insertions, 1 deletions

diff --git a/src/Protocol/Protocol.h b/src/Protocol/Protocol.h
index b5560f7c1..d3383bf0d 100644
--- a/src/Protocol/Protocol.h
+++ b/src/Protocol/Protocol.h
@@ -52,7 +52,7 @@ public:
 	virtual ~cProtocol() {}
 	
 	/// Called when client sends some data
-	virtual void DataReceived(const char * a_Data, int a_Size) = 0;
+	virtual void DataReceived(const char * a_Data, size_t a_Size) = 0;
 	
 	// Sending stuff to clients (alphabetically sorted):
 	virtual void SendAttachEntity        (const cEntity & a_Entity, const cEntity * a_Vehicle) = 0;