diff --git a/Cargo.toml b/Cargo.toml
index 82b991a..21790ae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -59,5 +59,8 @@ debug = true
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.9", features = ["winnls", "stringapiset"] }
 
+[target.'cfg(windows)'.build-dependencies]
+parse-size = "1"
+
 [target.'cfg(target_env = "gnu")'.dependencies]
 link-cplusplus = { version = "1.0", features = ["libstdc++"], optional = true }
diff --git a/build.rs b/build.rs
index 719ee34..2e46e24 100644
--- a/build.rs
+++ b/build.rs
@@ -13,7 +13,7 @@ fn main() {
     #[cfg(windows)]
     {
         let stack_size = std::env::var("STACK_SIZE").unwrap_or("4194304".to_string());
-        let stack_size = stack_size.parse::<usize>().unwrap();
+        let stack_size = parse_size::parse_size(stack_size).unwrap();
         println!("cargo:rerun-if-env-changed=STACK_SIZE");
         #[cfg(target_env = "msvc")]
         println!("cargo:rustc-link-arg=/STACK:{}", stack_size);