diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b2b7ee099..2035c96dc 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -142,4 +142,4 @@ jobs:
         with:
           toolchain: stable
       - name: Generate pregenerated metapac
-        run: cd stm32-metapac/gen; cargo run --release
+        run: cd stm32-metapac-gen; cargo run --release
diff --git a/Cargo.example.toml b/Cargo.example.toml
index c615d29ad..cbb221e7b 100644
--- a/Cargo.example.toml
+++ b/Cargo.example.toml
@@ -47,6 +47,12 @@ members = [
     #"examples/std",
 ]
 
+exclude = [
+    # This is only built as a build-dependency, for the host. It shouldn't
+    # get built for the target.
+    "stm32-metapac-gen"
+]
+
 [profile.dev]
 codegen-units = 1
 debug = 2
diff --git a/stm32-metapac/gen/Cargo.toml b/stm32-metapac-gen/Cargo.toml
similarity index 100%
rename from stm32-metapac/gen/Cargo.toml
rename to stm32-metapac-gen/Cargo.toml
diff --git a/stm32-metapac/gen/src/assets/build.rs b/stm32-metapac-gen/src/assets/build.rs
similarity index 100%
rename from stm32-metapac/gen/src/assets/build.rs
rename to stm32-metapac-gen/src/assets/build.rs
diff --git a/stm32-metapac/gen/src/assets/lib_inner.rs b/stm32-metapac-gen/src/assets/lib_inner.rs
similarity index 100%
rename from stm32-metapac/gen/src/assets/lib_inner.rs
rename to stm32-metapac-gen/src/assets/lib_inner.rs
diff --git a/stm32-metapac/gen/src/lib.rs b/stm32-metapac-gen/src/lib.rs
similarity index 97%
rename from stm32-metapac/gen/src/lib.rs
rename to stm32-metapac-gen/src/lib.rs
index 8eae49111..978f70b92 100644
--- a/stm32-metapac/gen/src/lib.rs
+++ b/stm32-metapac-gen/src/lib.rs
@@ -128,18 +128,17 @@ fn find_reg_for_field<'c>(
 }
 
 fn make_peripheral_counts(out: &mut String, data: &HashMap<String, u8>) {
-    write!(out,
-           "#[macro_export]
+    write!(
+        out,
+        "#[macro_export]
 macro_rules! peripheral_count {{
-    ").unwrap();
+    "
+    )
+    .unwrap();
     for (name, count) in data {
-        write!(out,
-            "({}) => ({});\n",
-            name, count,
-        ).unwrap();
+        write!(out, "({}) => ({});\n", name, count,).unwrap();
     }
-    write!(out,
-           " }}\n").unwrap();
+    write!(out, " }}\n").unwrap();
 }
 
 fn make_table(out: &mut String, name: &str, data: &Vec<Vec<String>>) {
@@ -155,7 +154,7 @@ macro_rules! {} {{
 ",
         name, name
     )
-        .unwrap();
+    .unwrap();
 
     for row in data {
         write!(out, "        __{}_inner!(({}));\n", name, row.join(",")).unwrap();
@@ -166,7 +165,7 @@ macro_rules! {} {{
         "    }};
 }}"
     )
-        .unwrap();
+    .unwrap();
 }
 
 pub struct Options {
@@ -341,7 +340,7 @@ pub fn gen(options: Options) {
                 peripherals_table.push(peripheral_row);
 
                 if let Some(old_version) =
-                peripheral_versions.insert(bi.module.clone(), bi.version.clone())
+                    peripheral_versions.insert(bi.module.clone(), bi.version.clone())
                 {
                     if old_version != bi.version {
                         panic!(
@@ -487,7 +486,11 @@ pub fn gen(options: Options) {
         make_table(&mut extra, "peripherals", &peripherals_table);
         make_table(&mut extra, "peripheral_versions", &peripheral_version_table);
         make_table(&mut extra, "peripheral_pins", &peripheral_pins_table);
-        make_table(&mut extra, "peripheral_dma_channels", &peripheral_dma_channels_table);
+        make_table(
+            &mut extra,
+            "peripheral_dma_channels",
+            &peripheral_dma_channels_table,
+        );
         make_table(&mut extra, "peripheral_rcc", &peripheral_rcc_table);
         make_table(&mut extra, "dma_channels", &dma_channels_table);
         make_table(&mut extra, "dma_requests", &dma_requests_table);
@@ -500,7 +503,7 @@ pub fn gen(options: Options) {
                 "#[path=\"../../peripherals/{}_{}.rs\"] pub mod {};\n",
                 module, version, module
             )
-                .unwrap();
+            .unwrap();
         }
 
         // Cleanups!
@@ -538,7 +541,7 @@ pub fn gen(options: Options) {
                 "PROVIDE({} = DefaultHandler);\n",
                 name.to_ascii_uppercase()
             )
-                .unwrap();
+            .unwrap();
         }
 
         File::create(chip_dir.join("device.x"))
@@ -566,7 +569,7 @@ pub fn gen(options: Options) {
             transform::NameKind::Enum => format!("vals::{}", s),
             _ => s.to_string(),
         })
-            .unwrap();
+        .unwrap();
 
         transform::sort::Sort {}.run(&mut ir).unwrap();
         transform::Sanitize {}.run(&mut ir).unwrap();
@@ -577,7 +580,7 @@ pub fn gen(options: Options) {
                 .join("src/peripherals")
                 .join(format!("{}_{}.rs", module, version)),
         )
-            .unwrap();
+        .unwrap();
         let data = items.to_string().replace("] ", "]\n");
 
         // Remove inner attributes like #![no_std]
@@ -600,14 +603,14 @@ pub fn gen(options: Options) {
                 "#[cfg_attr(feature=\"{}_{}\", path = \"chips/{}_{}/pac.rs\")]",
                 x, c, x, c
             )
-                .unwrap();
+            .unwrap();
         } else {
             write!(
                 &mut paths,
                 "#[cfg_attr(feature=\"{}\", path = \"chips/{}/pac.rs\")]",
                 x, x
             )
-                .unwrap();
+            .unwrap();
         }
     }
     let mut contents: Vec<u8> = Vec::new();
@@ -618,7 +621,7 @@ pub fn gen(options: Options) {
 
     // Generate src/lib.rs
     const CUT_MARKER: &[u8] = b"// GEN CUT HERE";
-    let librs = include_bytes!("../../src/lib.rs");
+    let librs = include_bytes!("../../stm32-metapac/src/lib.rs");
     let i = bytes_find(librs, CUT_MARKER).unwrap();
     let mut contents: Vec<u8> = Vec::new();
     contents.extend(&librs[..i]);
@@ -630,13 +633,13 @@ pub fn gen(options: Options) {
         out_dir.join("src").join("common.rs"),
         generate::COMMON_MODULE,
     )
-        .unwrap();
+    .unwrap();
 
     // Generate Cargo.toml
     const BUILDDEP_BEGIN: &[u8] = b"# BEGIN BUILD DEPENDENCIES";
     const BUILDDEP_END: &[u8] = b"# END BUILD DEPENDENCIES";
 
-    let mut contents = include_bytes!("../../Cargo.toml").to_vec();
+    let mut contents = include_bytes!("../../stm32-metapac/Cargo.toml").to_vec();
     let begin = bytes_find(&contents, BUILDDEP_BEGIN).unwrap();
     let end = bytes_find(&contents, BUILDDEP_END).unwrap() + BUILDDEP_END.len();
     contents.drain(begin..end);
diff --git a/stm32-metapac/gen/src/main.rs b/stm32-metapac-gen/src/main.rs
similarity index 90%
rename from stm32-metapac/gen/src/main.rs
rename to stm32-metapac-gen/src/main.rs
index bb76b9167..31f684046 100644
--- a/stm32-metapac/gen/src/main.rs
+++ b/stm32-metapac-gen/src/main.rs
@@ -3,7 +3,7 @@ use stm32_metapac_gen::*;
 
 fn main() {
     let out_dir = PathBuf::from("out");
-    let data_dir = PathBuf::from("../../stm32-data/data");
+    let data_dir = PathBuf::from("../stm32-data/data");
 
     let chips = std::fs::read_dir(data_dir.join("chips"))
         .unwrap()
diff --git a/stm32-metapac/Cargo.toml b/stm32-metapac/Cargo.toml
index 79f1c3746..2e01d5183 100644
--- a/stm32-metapac/Cargo.toml
+++ b/stm32-metapac/Cargo.toml
@@ -11,7 +11,7 @@ cortex-m-rt = { version = "0.6.8", optional = true }
 # BEGIN BUILD DEPENDENCIES
 # These are removed when generating the pre-generated crate using the tool at gen/.
 [build-dependencies]
-stm32-metapac-gen = { path = "./gen" }
+stm32-metapac-gen = { path = "../stm32-metapac-gen" }
 regex = "1.5.4"
 # END BUILD DEPENDENCIES
 
diff --git a/stm32-metapac/gen/.vscode/settings.json b/stm32-metapac/gen/.vscode/settings.json
deleted file mode 100644
index 23fd35f0e..000000000
--- a/stm32-metapac/gen/.vscode/settings.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "editor.formatOnSave": true
-}
\ No newline at end of file