diff --git a/src/Engine.cc b/src/Engine.cc
index 3f6049f..d64de56 100644
--- a/src/Engine.cc
+++ b/src/Engine.cc
@@ -1300,12 +1300,12 @@ const unsigned char *Engine::loadFile(const char *fname, unsigned int *len)
 bool Engine::loadWFObjFile(const char *fname, WFObj::Buffer & buff)
 {
     unsigned int size;
-    unsigned char *data = loadFile(fname, &size);
+    const unsigned char *data = loadFile(fname, &size);
     if (data != NULL)
     {
         buff.alloc(size);
         memcpy(buff.data, data, size);
-        free(data);
+        delete[] data;
         return true;
     }
     return false;