diff --git a/src/internal/category.rs b/src/internal/category.rs
index f74a29c..e6289b9 100644
--- a/src/internal/category.rs
+++ b/src/internal/category.rs
@@ -1,6 +1,6 @@
+use std::fmt;
 use std::io;
 use std::str;
-use std::{fmt, i16, i32};
 use uuid::Uuid;
 
 // ========================================================================= //
diff --git a/src/internal/column.rs b/src/internal/column.rs
index 24ec47e..bd55f59 100644
--- a/src/internal/column.rs
+++ b/src/internal/column.rs
@@ -2,9 +2,9 @@ use crate::internal::category::Category;
 use crate::internal::stringpool::StringRef;
 use crate::internal::value::{Value, ValueRef};
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
 use std::io::{self, Read, Write};
 use std::str;
-use std::{fmt, i16, i32};
 
 // ========================================================================= //
 
diff --git a/src/internal/stringpool.rs b/src/internal/stringpool.rs
index 3e259a1..4873113 100644
--- a/src/internal/stringpool.rs
+++ b/src/internal/stringpool.rs
@@ -1,7 +1,6 @@
 use crate::internal::codepage::CodePage;
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 use std::io::{self, Read, Write};
-use std::u16;
 
 // ========================================================================= //