diff --git a/pkgs/rust/kernaux/Cargo.toml b/pkgs/rust/kernaux/Cargo.toml
index 13cb34c..00b11cb 100644
--- a/pkgs/rust/kernaux/Cargo.toml
+++ b/pkgs/rust/kernaux/Cargo.toml
@@ -12,6 +12,13 @@ keywords = ["ffi", "embedded", "bindings"]
 categories = ["api-bindings", "embedded", "parsing"]
 publish = true
 
+[dependencies]
+ctor = "0.1.22"
+
 [dependencies.kernaux-sys]
 version = "0.3.0"
 path = "../kernaux-sys"
+
+[dependencies.libc]
+version = "0.2.113"
+default-features = false
diff --git a/pkgs/rust/kernaux/src/assert.rs b/pkgs/rust/kernaux/src/assert.rs
new file mode 100644
index 0000000..3e7dee2
--- /dev/null
+++ b/pkgs/rust/kernaux/src/assert.rs
@@ -0,0 +1,33 @@
+use ctor::ctor;
+use libc::{c_char, c_int};
+use std::ffi::CStr;
+
+#[ctor]
+unsafe fn ctor() {
+    kernaux_sys::assert_cb = Some(assert_cb);
+}
+
+unsafe extern "C" fn assert_cb(
+    file: *const c_char,
+    line: c_int,
+    msg: *const c_char,
+) {
+    let file = CStr::from_ptr(file).to_str().unwrap();
+    let msg = CStr::from_ptr(msg).to_str().unwrap();
+
+    panic!("{}:{}:{}", file, line, msg);
+}
+
+#[cfg(test)]
+mod tests {
+    use std::ffi::CString;
+
+    #[test]
+    #[should_panic(expected = "foo.rs:123:bar")]
+    fn default() {
+        let file = CString::new("foo.rs").unwrap();
+        let msg = CString::new("bar").unwrap();
+
+        unsafe { kernaux_sys::assert_do(file.as_ptr(), 123, msg.as_ptr()) }
+    }
+}
diff --git a/pkgs/rust/kernaux/src/lib.rs b/pkgs/rust/kernaux/src/lib.rs
index 350d2e4..9115180 100644
--- a/pkgs/rust/kernaux/src/lib.rs
+++ b/pkgs/rust/kernaux/src/lib.rs
@@ -1,3 +1,4 @@
+mod assert;
 mod ntoa;
 
 pub use ntoa::*;