diff --git a/src/lib.rs b/src/lib.rs
index 9b41e14..5185490 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -409,8 +409,11 @@ extern crate syn;
 extern crate quote;
 
 use std::collections::{HashMap, HashSet};
-use std::fs::{File, OpenOptions, create_dir};
-use std::io::{Seek, Write};
+use std::fs::{create_dir_all, File, OpenOptions};
+use std::{
+    io::{Seek, Write},
+    path::{Path, PathBuf},
+};
 
 use case::CaseExt;
 use syn::export::Span;
@@ -436,6 +439,14 @@ impl Parse for Machine {
     }
 }
 
+fn path_in_machine_target<P: AsRef<Path>>(relative_name: P) -> PathBuf {
+    let mut file_name = PathBuf::new();
+    file_name.push(std::env::var_os("CARGO_BUILD_TARGET_DIR").unwrap_or("target".into()));
+    file_name.push("machine");
+    file_name.push(relative_name);
+    file_name
+}
+
 #[proc_macro]
 pub fn machine(input: proc_macro::TokenStream) -> syn::export::TokenStream {
     let ast = parse_macro_input!(input as Machine);
@@ -444,9 +455,8 @@ pub fn machine(input: proc_macro::TokenStream) -> syn::export::TokenStream {
     let (name, gen) = impl_machine(&ast);
 
     trace!("generated: {}", gen);
-
-    let file_name = format!("target/machine/{}.rs", name.to_string().to_lowercase());
-    let _ = create_dir("target/machine");
+    let file_name = path_in_machine_target(name.to_string().to_lowercase());
+    let _ = create_dir_all(file_name.parent().unwrap());
     File::create(&file_name)
         .and_then(|mut file| {
             file.seek(std::io::SeekFrom::End(0))?;
@@ -647,11 +657,11 @@ impl Parse for Transition {
 
 impl Transitions {
     pub fn render(&self) {
-        let file_name = format!(
-            "target/machine/{}.dot",
+        let file_name = path_in_machine_target(format!(
+            "{}.dot",
             self.machine_name.to_string().to_lowercase()
-        );
-        let _ = create_dir("target/machine");
+        ));
+        let _ = create_dir_all(file_name.parent().unwrap());
         let mut file = File::create(&file_name).expect("error opening dot file");
 
         file.write_all(format!("digraph {} {{\n", self.machine_name.to_string()).as_bytes())
@@ -819,8 +829,10 @@ pub fn transitions(input: proc_macro::TokenStream) -> syn::export::TokenStream {
 
     //println!("generated: {:?}", gen);
     trace!("generated transitions: {}", stream);
-    let _ = create_dir("target/machine");
-    let file_name = format!("target/machine/{}.rs", machine_name.to_string().to_lowercase());
+    let file_name =
+        path_in_machine_target(format!("{}.rs", machine_name.to_string().to_lowercase()));
+    let _ = create_dir_all(file_name.parent().unwrap());
+
     OpenOptions::new()
         .create(true)
         .write(true)
@@ -1031,8 +1043,9 @@ pub fn methods(input: proc_macro::TokenStream) -> syn::export::TokenStream {
 
     stream.extend(proc_macro::TokenStream::from(toks));
 
-    let file_name = format!("target/machine/{}.rs", machine_name.to_string().to_lowercase());
-    let _ = create_dir("target/machine");
+    let file_name =
+        path_in_machine_target(format!("{}.rs", machine_name.to_string().to_lowercase()));
+    let _ = create_dir_all(file_name.parent().unwrap());
     OpenOptions::new()
         .create(true)
         .write(true)