diff --git a/FileLoader.h b/FileLoader.h
index 0eb8f56..df80fbe 100644
--- a/FileLoader.h
+++ b/FileLoader.h
@@ -7,9 +7,10 @@
 class FileLoader
 {
     public:
-        void * loadFile(const std::string & fullPath,
-                        const std::string & shortPath,
-                        int & size);
+        virtual void * loadFile(
+                const std::string & fullPath,
+                const std::string & shortPath,
+                int & size) = 0;
 };
 
 #endif