diff --git a/Cargo.lock b/Cargo.lock
index 28936dc..830ca58 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -719,7 +719,6 @@ version = "0.2.0"
 dependencies = [
  "bitflags 2.5.0",
  "log",
- "thiserror",
 ]
 
 [[package]]
diff --git a/protocol/Cargo.toml b/protocol/Cargo.toml
index 83a8484..2bbee0e 100644
--- a/protocol/Cargo.toml
+++ b/protocol/Cargo.toml
@@ -12,6 +12,5 @@ homepage = "https://xash.su"
 repository = "https://git.mentality.rip/numas13/xash3d-master"
 
 [dependencies]
-thiserror = "1.0.49"
 log = "0.4.18"
 bitflags = "2.4"
diff --git a/protocol/src/cursor.rs b/protocol/src/cursor.rs
index a8d2524..1902064 100644
--- a/protocol/src/cursor.rs
+++ b/protocol/src/cursor.rs
@@ -6,43 +6,51 @@ use std::{
     mem, str,
 };
 
-use thiserror::Error;
-
 use super::color;
 use super::wrappers::Str;
 
 /// The error type for `Cursor` and `CursorMut`.
-#[derive(Error, Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq)]
 pub enum CursorError {
     /// Invalid number.
-    #[error("Invalid number")]
     InvalidNumber,
     /// Invalid string.
-    #[error("Invalid string")]
     InvalidString,
     /// Invalid boolean.
-    #[error("Invalid boolean")]
     InvalidBool,
     /// Invalid table entry.
-    #[error("Invalid table key")]
     InvalidTableKey,
     /// Invalid table entry.
-    #[error("Invalid table entry")]
     InvalidTableValue,
     /// Table end found.
-    #[error("Table end")]
     TableEnd,
     /// Expected data not found.
-    #[error("Expected data not found")]
     Expect,
     /// An unexpected data found.
-    #[error("Unexpected data")]
     ExpectEmpty,
     /// Buffer size is no enougth to decode or encode a packet.
-    #[error("Unexpected end of buffer")]
     UnexpectedEnd,
 }
 
+impl fmt::Display for CursorError {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let s = match self {
+            Self::InvalidNumber => "Invalid number",
+            Self::InvalidString => "Invalid string",
+            Self::InvalidBool => "Invalid boolean",
+            Self::InvalidTableKey => "Invalid table key",
+            Self::InvalidTableValue => "Invalid table entry",
+            Self::TableEnd => "Table end",
+            Self::Expect => "Expected data not found",
+            Self::ExpectEmpty => "Unexpected data",
+            Self::UnexpectedEnd => "Unexpected end of buffer",
+        };
+        s.fmt(fmt)
+    }
+}
+
+impl std::error::Error for CursorError {}
+
 pub type Result<T, E = CursorError> = std::result::Result<T, E>;
 
 pub trait GetKeyValue<'a>: Sized {
diff --git a/protocol/src/lib.rs b/protocol/src/lib.rs
index 80f8a5a..0fd2dfe 100644
--- a/protocol/src/lib.rs
+++ b/protocol/src/lib.rs
@@ -20,11 +20,11 @@ pub mod master;
 pub mod server;
 pub mod wrappers;
 
+use std::fmt;
+
 pub use cursor::CursorError;
 pub use server_info::ServerInfo;
 
-use thiserror::Error;
-
 use crate::filter::Version;
 
 /// Current protocol version.
@@ -33,30 +33,53 @@ pub const PROTOCOL_VERSION: u8 = 49;
 pub const CLIENT_VERSION: Version = Version::new(0, 20);
 
 /// The error type for decoding and encoding packets.
-#[derive(Error, Debug, PartialEq, Eq)]
+#[derive(Debug, PartialEq, Eq)]
 pub enum Error {
     /// Failed to decode a packet.
-    #[error("Invalid packet")]
     InvalidPacket,
     /// Invalid region.
-    #[error("Invalid region")]
     InvalidRegion,
     /// Invalid client announce IP.
-    #[error("Invalid client announce IP")]
     InvalidClientAnnounceIp,
     /// Invalid last IP.
-    #[error("Invalid last server IP")]
     InvalidQueryServersLast,
     /// Server protocol version is not supported.
-    #[error("Invalid protocol version")]
     InvalidProtocolVersion,
     /// Cursor error.
-    #[error("{0}")]
-    CursorError(#[from] CursorError),
+    CursorError(CursorError),
     /// Invalid value for server add packet.
-    #[error("Invalid value for server add key `{0}`: {1}")]
-    InvalidServerValue(&'static str, #[source] CursorError),
+    InvalidServerValue(&'static str, CursorError),
     /// Invalid value for query servers packet.
-    #[error("Invalid value for filter key `{0}`: {1}")]
-    InvalidFilterValue(&'static str, #[source] CursorError),
+    InvalidFilterValue(&'static str, CursorError),
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Self::InvalidPacket => "Invalid packet".fmt(fmt),
+            Self::InvalidRegion => "Invalid region".fmt(fmt),
+            Self::InvalidClientAnnounceIp => "Invalid client announce IP".fmt(fmt),
+            Self::InvalidQueryServersLast => "Invalid last server IP".fmt(fmt),
+            Self::InvalidProtocolVersion => "Invalid protocol version".fmt(fmt),
+            Self::CursorError(source) => source.fmt(fmt),
+            Self::InvalidServerValue(key, source) => {
+                write!(
+                    fmt,
+                    "Invalid value for server add key `{}`: {}",
+                    key, source
+                )
+            }
+            Self::InvalidFilterValue(key, source) => {
+                write!(fmt, "Invalid value for filter key `{}`: {}", key, source)
+            }
+        }
+    }
+}
+
+impl std::error::Error for Error {}
+
+impl From<CursorError> for Error {
+    fn from(source: CursorError) -> Self {
+        Self::CursorError(source)
+    }
 }