diff --git a/crates/prelude/CHANGELOG.md b/crates/prelude/CHANGELOG.md
index 2ac2d3347..def056b34 100644
--- a/crates/prelude/CHANGELOG.md
+++ b/crates/prelude/CHANGELOG.md
@@ -113,4 +113,4 @@
 
 ## 0.1.0
 
-<!-- Increment to skip CHANGELOG.md test: 19 -->
+<!-- Increment to skip CHANGELOG.md test: 20 -->
diff --git a/crates/prelude/src/callback.rs b/crates/prelude/src/callback.rs
index 80926c143..403b49500 100644
--- a/crates/prelude/src/callback.rs
+++ b/crates/prelude/src/callback.rs
@@ -20,7 +20,7 @@ macro_rules! define {
     (#[$m:meta] $n:ident $(, $x:ident)*) => {
         #[$m] #[no_mangle]
         extern "C" fn $n (
-            ptr: extern "C" fn(*const u8 $(, usize ${ignore($x)})*),
+            ptr: extern "C" fn(*const u8 $(, usize ${ignore(x)})*),
             this: *const u8 $(, $x: usize)*
         ) {
             ptr(this $(, $x)*);
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 903caa937..1260a17ee 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2023-12-15"
+channel = "nightly-2023-11-14"
 components = ["clippy", "llvm-tools", "rust-src", "rustfmt"]
 targets = [
   "i686-unknown-linux-gnu",