diff --git a/src/preprocess/cmd.rs b/crates/mdbook-driver/src/builtin_preprocessors/cmd.rs
similarity index 100%
rename from src/preprocess/cmd.rs
rename to crates/mdbook-driver/src/builtin_preprocessors/cmd.rs
diff --git a/src/preprocess/index.rs b/crates/mdbook-driver/src/builtin_preprocessors/index.rs
similarity index 100%
rename from src/preprocess/index.rs
rename to crates/mdbook-driver/src/builtin_preprocessors/index.rs
diff --git a/src/preprocess/links.rs b/crates/mdbook-driver/src/builtin_preprocessors/links.rs
similarity index 100%
rename from src/preprocess/links.rs
rename to crates/mdbook-driver/src/builtin_preprocessors/links.rs
diff --git a/src/preprocess/mod.rs b/crates/mdbook-driver/src/builtin_preprocessors/mod.rs
similarity index 100%
rename from src/preprocess/mod.rs
rename to crates/mdbook-driver/src/builtin_preprocessors/mod.rs