diff --git a/src/lib.rs b/src/lib.rs
index 4f7b78a..b0abced 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1105,6 +1105,8 @@ fn default_cfg(target: &str) -> Vec<(String, Option<String>)> {
         ("dragonfly", "unix", "")
     } else if target.contains("solaris") {
         ("solaris", "unix", "")
+    } else if target.contains("illumos") {
+        ("illumos", "unix", "")
     } else if target.contains("emscripten") {
         ("emscripten", "unix", "")
     } else if target.contains("wasi") {