diff --git a/el-compiler/runtime/el_runtime.h b/el-compiler/runtime/el_runtime.h
index 8b80ee7..bcf8f59 100644
--- a/el-compiler/runtime/el_runtime.h
+++ b/el-compiler/runtime/el_runtime.h
@@ -756,6 +756,9 @@ el_val_t trace_span_start(el_val_t name);
 el_val_t trace_span_end(el_val_t span_handle);
 el_val_t emit_event(el_val_t name, el_val_t duration_ms);
 
+el_val_t __thread_create(el_val_t fn_name_v, el_val_t arg_v);
+el_val_t __thread_join(el_val_t tid_v);
+
 #ifdef __cplusplus
 }
 #endif