diff --git a/crates/rsonpath-lib/src/classification/simd.rs b/crates/rsonpath-lib/src/classification/simd.rs
index 37c8648c..d8f98945 100644
--- a/crates/rsonpath-lib/src/classification/simd.rs
+++ b/crates/rsonpath-lib/src/classification/simd.rs
@@ -461,7 +461,7 @@ pub(crate) enum SimdTag {
 }
 
 /// Runtime-detected SIMD configuration guiding how to construct a [`Simd`] implementation for the engine.
-#[derive(Clone, Copy)]
+#[derive(Debug, Clone, Copy)]
 pub(crate) struct SimdConfiguration {
     highest_simd: SimdTag,
     fast_quotes: bool,
diff --git a/crates/rsonpath-lib/src/engine/main.rs b/crates/rsonpath-lib/src/engine/main.rs
index 77dfb103..1d8b2d7d 100644
--- a/crates/rsonpath-lib/src/engine/main.rs
+++ b/crates/rsonpath-lib/src/engine/main.rs
@@ -69,6 +69,7 @@ use smallvec::{smallvec, SmallVec};
 ///
 /// The engine is stateless, meaning that it can be executed
 /// on any number of separate inputs, even on separate threads.
+#[derive(Debug)]
 pub struct MainEngine {
     automaton: Automaton,
     simd: SimdConfiguration,