diff --git a/recipes/sandbox/60-side-by-side-assembly-ruby-3.4+.rake b/recipes/sandbox/60-side-by-side-assembly-ruby-3.4+.rake
index d0966452..761dd5e2 100644
--- a/recipes/sandbox/60-side-by-side-assembly-ruby-3.4+.rake
+++ b/recipes/sandbox/60-side-by-side-assembly-ruby-3.4+.rake
@@ -24,6 +24,7 @@ if package.rubyver2 >= "3.4"
   core_dll_defs = [
     /^libgmp-\d+.dll$/,
     /^libgcc_s_.*.dll$/,
+    /^libwinpthread-\d+.dll$/,
   ]
 
   # create rake tasks to trigger additional processing of so files