diff --git a/src/build_context.rs b/src/build_context.rs
index 11bad5b40..09b83a7f0 100644
--- a/src/build_context.rs
+++ b/src/build_context.rs
@@ -6,8 +6,9 @@ use crate::compile::warn_missing_py_init;
 use crate::module_writer::write_python_part;
 use crate::module_writer::WheelWriter;
 use crate::module_writer::{write_bin, write_bindings_module, write_cffi_module};
-use crate::source_distribution::{get_pyproject_toml, source_distribution};
+use crate::source_distribution::source_distribution;
 use crate::Metadata21;
+use crate::PyProjectToml;
 use crate::PythonInterpreter;
 use crate::Target;
 use anyhow::{anyhow, bail, Context, Result};
@@ -153,7 +154,7 @@ impl BuildContext {
         fs::create_dir_all(&self.out)
             .context("Failed to create the target directory for the source distribution")?;
 
-        match get_pyproject_toml(self.manifest_path.parent().unwrap()) {
+        match PyProjectToml::new(self.manifest_path.parent().unwrap()) {
             Ok(pyproject) => {
                 let sdist_path = source_distribution(
                     &self.out,
diff --git a/src/lib.rs b/src/lib.rs
index 0ba6226ac..e83b2c016 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -36,13 +36,14 @@ pub use crate::metadata::{Metadata21, WheelMetadata};
 pub use crate::module_writer::{
     write_dist_info, ModuleWriter, PathWriter, SDistWriter, WheelWriter,
 };
+pub use crate::pyproject_toml::PyProjectToml;
 pub use crate::python_interpreter::PythonInterpreter;
 pub use crate::read_distribution::{
     get_metadata_for_distribution, get_supported_version_for_distribution,
 };
 pub use crate::target::Target;
 pub use auditwheel::Manylinux;
-pub use source_distribution::{get_pyproject_toml, source_distribution};
+pub use source_distribution::source_distribution;
 #[cfg(feature = "upload")]
 pub use {
     crate::registry::Registry,
@@ -57,6 +58,7 @@ mod compile;
 mod develop;
 mod metadata;
 mod module_writer;
+mod pyproject_toml;
 mod python_interpreter;
 mod read_distribution;
 #[cfg(feature = "upload")]
diff --git a/src/main.rs b/src/main.rs
index 1418ddc70..a94e64bd7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,10 +15,9 @@ use human_panic::setup_panic;
 #[cfg(feature = "password-storage")]
 use keyring::{Keyring, KeyringError};
 use maturin::{
-    develop, get_metadata_for_distribution, get_pyproject_toml,
-    get_supported_version_for_distribution, source_distribution, write_dist_info, BridgeModel,
-    BuildOptions, BuiltWheelMetadata, CargoToml, Manylinux, Metadata21, PathWriter,
-    PythonInterpreter, Target,
+    develop, get_metadata_for_distribution, get_supported_version_for_distribution,
+    source_distribution, write_dist_info, BridgeModel, BuildOptions, BuiltWheelMetadata, CargoToml,
+    Manylinux, Metadata21, PathWriter, PyProjectToml, PythonInterpreter, Target,
 };
 use std::env;
 use std::path::PathBuf;
@@ -574,7 +573,7 @@ fn run() -> Result<()> {
             let manifest_dir = manifest_path.parent().unwrap();
 
             // Ensure the project has a compliant pyproject.toml
-            let pyproject = get_pyproject_toml(&manifest_dir)
+            let pyproject = PyProjectToml::new(&manifest_dir)
                 .context("A pyproject.toml with a PEP 517 compliant `[build-system]` table is required to build a source distribution")?;
 
             let cargo_toml = CargoToml::from_path(&manifest_path)?;
diff --git a/src/pyproject_toml.rs b/src/pyproject_toml.rs
new file mode 100644
index 000000000..4a38169a0
--- /dev/null
+++ b/src/pyproject_toml.rs
@@ -0,0 +1,56 @@
+use anyhow::{format_err, Context, Result};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::Path;
+
+/// The `[build-system]` section of a pyproject.toml as specified in PEP 517
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "kebab-case")]
+pub struct BuildSystem {
+    requires: Vec<String>,
+    build_backend: String,
+}
+
+/// The `[tool]` section of a pyproject.toml
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "kebab-case")]
+pub struct Tool {
+    maturin: Option<ToolMaturin>,
+}
+
+/// The `[tool.maturin]` section of a pyproject.toml
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "kebab-case")]
+pub struct ToolMaturin {
+    sdist_include: Option<Vec<String>>,
+}
+
+/// A pyproject.toml as specified in PEP 517
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "kebab-case")]
+pub struct PyProjectToml {
+    build_system: BuildSystem,
+    tool: Option<Tool>,
+}
+
+impl PyProjectToml {
+    /// Returns the contents of a pyproject.toml with a `[build-system]` entry or an error
+    ///
+    /// Does no specific error handling because it's only used to check whether or not to build
+    /// source distributions
+    pub fn new(project_root: impl AsRef<Path>) -> Result<PyProjectToml> {
+        let path = project_root.as_ref().join("pyproject.toml");
+        let contents = fs::read_to_string(&path).context(format!(
+            "Couldn't find pyproject.toml at {}",
+            path.display()
+        ))?;
+        let cargo_toml = toml::from_str(&contents)
+            .map_err(|err| format_err!("pyproject.toml is not PEP 517 compliant: {}", err))?;
+        Ok(cargo_toml)
+    }
+
+    /// Returns the value of `[maturin.sdist-include]` in pyproject.toml
+    pub fn sdist_include(&self) -> Option<&Vec<String>> {
+        self.tool.as_ref()?.maturin.as_ref()?.sdist_include.as_ref()
+    }
+}
diff --git a/src/source_distribution.rs b/src/source_distribution.rs
index 11ec4fc27..b2b3d8e5d 100644
--- a/src/source_distribution.rs
+++ b/src/source_distribution.rs
@@ -1,10 +1,9 @@
 use crate::module_writer::ModuleWriter;
 use crate::{Metadata21, SDistWriter};
-use anyhow::{bail, format_err, Context, Result};
+use anyhow::{bail, Context, Result};
 use cargo_metadata::Metadata;
 use fs_err as fs;
 use regex::Regex;
-use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -246,54 +245,3 @@ pub fn source_distribution(
 
     Ok(source_distribution_path)
 }
-
-/// The `[build-system]` section of a pyproject.toml as specified in PEP 517
-#[derive(Serialize, Deserialize, Debug, Clone)]
-#[serde(rename_all = "kebab-case")]
-pub struct BuildSystem {
-    requires: Vec<String>,
-    build_backend: String,
-}
-
-/// The `[tool]` section of a pyproject.toml
-#[derive(Serialize, Deserialize, Debug, Clone)]
-#[serde(rename_all = "kebab-case")]
-pub struct Tool {
-    maturin: Option<ToolMaturin>,
-}
-
-/// The `[tool.maturin]` section of a pyproject.toml
-#[derive(Serialize, Deserialize, Debug, Clone)]
-#[serde(rename_all = "kebab-case")]
-pub struct ToolMaturin {
-    sdist_include: Option<Vec<String>>,
-}
-
-/// A pyproject.toml as specified in PEP 517
-#[derive(Serialize, Deserialize, Debug, Clone)]
-#[serde(rename_all = "kebab-case")]
-pub struct PyProjectToml {
-    build_system: BuildSystem,
-    tool: Option<Tool>,
-}
-
-impl PyProjectToml {
-    pub fn sdist_include(&self) -> Option<&Vec<String>> {
-        self.tool.as_ref()?.maturin.as_ref()?.sdist_include.as_ref()
-    }
-}
-
-/// Returns the contents of a pyproject.toml with a `[build-system]` entry or an error
-///
-/// Does no specific error handling because it's only used to check whether or not to build
-/// source distributions
-pub fn get_pyproject_toml(project_root: impl AsRef<Path>) -> Result<PyProjectToml> {
-    let path = project_root.as_ref().join("pyproject.toml");
-    let contents = fs::read_to_string(&path).context(format!(
-        "Couldn't find pyproject.toml at {}",
-        path.display()
-    ))?;
-    let cargo_toml = toml::from_str(&contents)
-        .map_err(|err| format_err!("pyproject.toml is not PEP 517 compliant: {}", err))?;
-    Ok(cargo_toml)
-}