diff --git a/Cargo.toml b/Cargo.toml
index 1f71b0a..99680e1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,3 +31,5 @@ panic = "abort"
 
 [package.metadata.docs.rs]
 default-target = "thumbv4t-none-eabi"
+cargoflags = ["-Zbuild-std=core"]
+rustdoc-args = ["--cfg","docs_rs"]
diff --git a/build.rs b/build.rs
index 9424dba..d831351 100644
--- a/build.rs
+++ b/build.rs
@@ -1,17 +1,20 @@
 fn main() {
+  // we skip assembling the runtime for docs.rs builds.
+  if !cfg!(docs_rs) {
     let out_file = "rsrt0.o";
     let out_dir = std::env::var("OUT_DIR").unwrap();
     let out_dir_file = format!("{}/{}", out_dir, out_file);
     let as_output = std::process::Command::new("arm-none-eabi-as")
-        .args(&["-o", out_dir_file.as_str()])
-        .arg("-mthumb-interwork")
-        .arg("-mcpu=arm7tdmi")
-        .arg("src/rsrt0.S")
-        .output()
-        .expect("failed to run arm-none-eabi-as");
+      .args(&["-o", out_dir_file.as_str()])
+      .arg("-mthumb-interwork")
+      .arg("-mcpu=arm7tdmi")
+      .arg("src/rsrt0.S")
+      .output()
+      .expect("failed to run arm-none-eabi-as");
     if !as_output.status.success() {
-        panic!("{}", String::from_utf8_lossy(&as_output.stderr));
+      panic!("{}", String::from_utf8_lossy(&as_output.stderr));
     }
     //
     println!("cargo:rustc-link-search={}", out_dir);
-}
\ No newline at end of file
+  }
+}