diff --git a/doc/Doxyfile b/doc/Doxyfile
index 5cab419..89cf6a2 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -873,7 +873,7 @@ RECURSIVE              = YES
 # Note that relative paths are relative to the directory from which doxygen is
 # run.
 
-EXCLUDE                =
+EXCLUDE                = ../ostd/internal
 
 # The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
 # directories that are symbolic links (a Unix file system feature) are excluded