diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cf4b6c719..d92797e587 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Versions with only mechanical changes will be omitted from the following list.
 * Fix `DurationRound` is not TZ aware (#495)
 * Implement `DurationRound` for `NaiveDateTime`
 * Add `DateTime::from_local()` to construct from given local date and time (#572)
+* Correct build for wasm32-unknown-emscripten target (#568)
 
 ## 0.4.19
 
diff --git a/src/sys.rs b/src/sys.rs
index 2e46b7e8eb..0fa67838eb 100644
--- a/src/sys.rs
+++ b/src/sys.rs
@@ -20,11 +20,11 @@ use std::time::{SystemTime, UNIX_EPOCH};
 #[path = "sys/stub.rs"]
 mod inner;
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_arch = "wasm32"), not(target_env = "sgx")))]
 #[path = "sys/unix.rs"]
 mod inner;
 
-#[cfg(windows)]
+#[cfg(all(windows, not(target_arch = "wasm32"), not(target_env = "sgx")))]
 #[path = "sys/windows.rs"]
 mod inner;