diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbe3f96b..1f9266d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,11 @@ Bug fixes
 * Fixes panic in interpolated strings with constant expressions.
 * Using `call_fn_raw` on a function without evaluating the AST no longer panics on namespace-qualified function calls due to `import` statements not run.
 
+Breaking changes
+----------------
+
+* The first closure passed to `Engine::register_debugger` now takes a single parameter which is a reference to the current `Engine`.
+
 New features
 ------------
 
diff --git a/src/api/events.rs b/src/api/events.rs
index f77633c4..266c70c8 100644
--- a/src/api/events.rs
+++ b/src/api/events.rs
@@ -348,7 +348,7 @@ impl Engine {
     #[inline(always)]
     pub fn register_debugger(
         &mut self,
-        init: impl Fn() -> Dynamic + SendSync + 'static,
+        init: impl Fn(&Engine) -> Dynamic + SendSync + 'static,
         callback: impl Fn(
                 EvalContext,
                 crate::eval::DebuggerEvent,
diff --git a/src/bin/rhai-dbg.rs b/src/bin/rhai-dbg.rs
index d51d877d..30d521fa 100644
--- a/src/bin/rhai-dbg.rs
+++ b/src/bin/rhai-dbg.rs
@@ -611,7 +611,7 @@ fn main() {
     #[allow(deprecated)]
     engine.register_debugger(
         // Store the current source in the debugger state
-        || "".into(),
+        |_| "".into(),
         // Main debugging interface
         move |context, event, node, source, pos| {
             debug_callback(context, event, node, source, pos, &lines)
diff --git a/src/eval/debugger.rs b/src/eval/debugger.rs
index 2198dda2..bfdb2af5 100644
--- a/src/eval/debugger.rs
+++ b/src/eval/debugger.rs
@@ -10,10 +10,10 @@ use std::{fmt, iter::repeat, mem};
 
 /// Callback function to initialize the debugger.
 #[cfg(not(feature = "sync"))]
-pub type OnDebuggingInit = dyn Fn() -> Dynamic;
+pub type OnDebuggingInit = dyn Fn(&Engine) -> Dynamic;
 /// Callback function to initialize the debugger.
 #[cfg(feature = "sync")]
-pub type OnDebuggingInit = dyn Fn() -> Dynamic + Send + Sync;
+pub type OnDebuggingInit = dyn Fn(&Engine) -> Dynamic + Send + Sync;
 
 /// Callback function for debugging.
 #[cfg(not(feature = "sync"))]
diff --git a/src/eval/global_state.rs b/src/eval/global_state.rs
index 7421a95a..83b2b076 100644
--- a/src/eval/global_state.rs
+++ b/src/eval/global_state.rs
@@ -106,7 +106,7 @@ impl GlobalRuntimeState<'_> {
                     crate::eval::DebuggerStatus::CONTINUE
                 },
                 if let Some((ref init, ..)) = engine.debugger {
-                    init()
+                    init(engine)
                 } else {
                     Dynamic::UNIT
                 },