diff --git a/public/eiface.h b/public/eiface.h
index 688f2283..77afbf29 100644
--- a/public/eiface.h
+++ b/public/eiface.h
@@ -126,7 +126,7 @@ class CPlayerUserId
 	bool operator!=( const CPlayerUserId &other ) const { return other._index != _index; }
 
 private:
-	short _index;
+	unsigned short _index;
 };
 
 //-----------------------------------------------------------------------------