--- a/src/main.rs
+++ b/src/main.rs
@@ -34,7 +34,13 @@
 
 fn main() {
     // Close all fds we inherited from our parent process, we only need stdio.
+    // musl's libc crate exposes SYS_close_range but not the safe
+    // wrapper (only defined for target_env = "gnu" upstream), so fall
+    // back to the raw syscall there.
+    #[cfg(target_env = "gnu")]
     let _ = unsafe { libc::close_range(3, libc::c_uint::MAX, 0) };
+    #[cfg(not(target_env = "gnu"))]
+    let _ = unsafe { libc::syscall(libc::SYS_close_range, 3u32, libc::c_uint::MAX, 0u32) };
 
     let formatter = Formatter3164 {
         facility: Facility::LOG_USER,