diff --git a/src/lib.rs b/src/lib.rs
index 5758e2a..30ba531 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -910,6 +910,8 @@ fn default_cfg(target: &str) -> Vec<(String, Option<String>)> {
         ("dragonfly", "unix", "")
     } else if target.contains("solaris") {
         ("solaris", "unix", "")
+    } else if target.starts_with("wasm32") {
+        ("emscripten", "unix", "")
     } else if target.contains("emscripten") {
         ("emscripten", "unix", "")
     } else {