diff --git a/src/coreclr/src/pal/src/include/pal/thread.hpp b/src/coreclr/src/pal/src/include/pal/thread.hpp
index ad2948627b830..cb4cb9f9abcd8 100644
--- a/src/coreclr/src/pal/src/include/pal/thread.hpp
+++ b/src/coreclr/src/pal/src/include/pal/thread.hpp
@@ -92,6 +92,13 @@ namespace CorUnix
         HANDLE *phThread
         );
 
+    PAL_ERROR
+    InternalSetThreadDescription(
+        CPalThread *,
+        HANDLE,
+        PCWSTR
+        );
+
     PAL_ERROR
     CreateThreadData(
         CPalThread **ppThread