diff --git a/Cargo.lock b/Cargo.lock
index 9a017a4..aa113e5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -15,6 +15,21 @@ version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "28b2cd92db5cbd74e8e5028f7e27dd7aa3090e89e4f2a197cc7c8dfb69c7063b"
 
+[[package]]
+name = "atoi"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "616896e05fc0e2649463a93a15183c6a16bf03413a7af88ef1285ddedfa9cda5"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
 [[package]]
 name = "ctor"
 version = "0.1.20"
@@ -31,6 +46,15 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
 
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "output_vt100"
 version = "0.1.2"
@@ -114,5 +138,6 @@ name = "yary"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "atoi",
  "pretty_assertions",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index a8eae12..a9af079 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,5 +9,7 @@ edition = "2018"
 [dependencies]
 anyhow = "1"
 
+atoi = "0.4"
+
 [dev-dependencies]
 pretty_assertions = "0.7"