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-rw-r--r--src/libstd/sys/unix/fast_thread_local.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/libstd/sys/unix/fast_thread_local.rs b/src/libstd/sys/unix/fast_thread_local.rs
index 952ba40ee87..d7e733b7fa0 100644
--- a/src/libstd/sys/unix/fast_thread_local.rs
+++ b/src/libstd/sys/unix/fast_thread_local.rs
@@ -10,7 +10,8 @@
 // fallback implementation to use as well.
 //
 // Due to rust-lang/rust#18804, make sure this is not generic!
-#[cfg(any(target_os = "linux", target_os = "fuchsia", target_os = "hermit", target_os = "redox"))]
+#[cfg(any(target_os = "linux", target_os = "fuchsia", target_os = "hermit", target_os = "redox",
+          target_os = "emscripten"))]
 pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
     use crate::mem;
     use crate::sys_common::thread_local::register_dtor_fallback;