diff --git a/Cargo.toml b/Cargo.toml
index 8277f37..8856572 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "libwebp-sys"
-version = "0.14.3"
+version = "0.14.4"
 authors = [
     "XianYou <xianyou.cyq@alibaba-inc.com>",
     "Kornel Lesiński <kornel@geekhood.net>",
diff --git a/build.rs b/build.rs
index f6c9dc1..7f65200 100644
--- a/build.rs
+++ b/build.rs
@@ -93,7 +93,9 @@ fn setup_build(build: &mut cc::Build, include_dir: &PathBuf) {
     build.include(include_dir);
     build.define("NDEBUG", Some("1"));
     build.define("_THREAD_SAFE", Some("1"));
-    build.define("WEBP_USE_THREAD", Some("1"));
+    if cfg!(feature = "std") {
+        build.define("WEBP_USE_THREAD", Some("1"));
+    }
     if !build.get_compiler().is_like_msvc() {
         build.flag("-fvisibility=hidden").flag("-Wall");
     } else {