diff --git a/Cargo.lock b/Cargo.lock
index b88398a3..5aa5078f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -511,7 +511,6 @@ dependencies = [
  "insta",
  "itertools",
  "nac3parser",
- "num-traits",
  "parking_lot",
  "rayon",
  "test-case",
@@ -527,7 +526,6 @@ dependencies = [
  "lalrpop-util",
  "log",
  "nac3ast",
- "num-traits",
  "phf",
  "unic-emoji-char",
  "unic-ucd-ident",
@@ -550,15 +548,6 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e4a24736216ec316047a1fc4252e27dabb04218aa4a3f37c6e7ddbf1f9782b54"
 
-[[package]]
-name = "num-traits"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "num_cpus"
 version = "1.13.1"
diff --git a/nac3core/Cargo.toml b/nac3core/Cargo.toml
index 2c508979..64408af8 100644
--- a/nac3core/Cargo.toml
+++ b/nac3core/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["M-Labs"]
 edition = "2018"
 
 [dependencies]
-num-traits = "0.2"
 itertools = "0.10.1"
 crossbeam = "0.8.1"
 parking_lot = "0.11.1"
diff --git a/nac3parser/Cargo.toml b/nac3parser/Cargo.toml
index 34e94284..926b2a29 100644
--- a/nac3parser/Cargo.toml
+++ b/nac3parser/Cargo.toml
@@ -14,7 +14,6 @@ lalrpop = "0.19.6"
 nac3ast = { path = "../nac3ast" }
 lalrpop-util = "0.19.6"
 log = "0.4.1"
-num-traits = "0.2"
 unic-emoji-char = "0.9"
 unic-ucd-ident  = "0.9"
 unicode_names2 = "0.4"
diff --git a/nac3parser/src/lexer.rs b/nac3parser/src/lexer.rs
index 44a0c0c8..10e871c8 100644
--- a/nac3parser/src/lexer.rs
+++ b/nac3parser/src/lexer.rs
@@ -5,7 +5,6 @@
 pub use super::token::Tok;
 use crate::ast::Location;
 use crate::error::{LexicalError, LexicalErrorType};
-use num_traits::identities::Zero;
 use std::char;
 use std::cmp::Ordering;
 use std::str::FromStr;
@@ -364,7 +363,7 @@ where
                 // parse should only fail because of overflow.
                 let value = value_text.parse::<i64>().ok();
                 let nonzero = match value {
-                    Some(value) => !value.is_zero(),
+                    Some(value) => value != 0i64,
                     None => true
                 };
                 if start_is_zero && nonzero {