diff --git a/src/tools/base64tool.cpp b/src/tools/base64tool.cpp
index be35ffab3..f307d1556 100644
--- a/src/tools/base64tool.cpp
+++ b/src/tools/base64tool.cpp
@@ -88,7 +88,7 @@ main(int argc,
   }
 
   in->save_pos();
-  in->setFilePointer(0, seek_end);
+  in->setFilePointer(0, libebml::seek_end);
   size = in->getFilePointer();
   in->restore_pos();