diff --git a/internal/rosa/llvm.go b/internal/rosa/llvm.go
index 5305884b..e68ab6aa 100644
--- a/internal/rosa/llvm.go
+++ b/internal/rosa/llvm.go
@@ -170,7 +170,22 @@ ln -s ld.lld /work/system/bin/ld
 		mustDecode(llvmChecksum),
 		pkg.TarGzip,
 	), &PackageAttr{
-		Patches:   attr.patches,
+		Patches: slices.Concat(attr.patches, []KV{
+			{"increase-stack-size-unconditional", `diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
+index 9da357a7ebb9..b2931510c1ae 100644
+--- a/llvm/lib/Support/Threading.cpp
++++ b/llvm/lib/Support/Threading.cpp
+@@ -80,7 +80,7 @@ unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
+ // keyword.
+ #include "llvm/Support/thread.h"
+ 
+-#if defined(__APPLE__)
++#if defined(__APPLE__) || 1
+   // Darwin's default stack size for threads except the main one is only 512KB,
+   // which is not enough for some/many normal LLVM compilations. This implements
+   // the same interface as std::thread but requests the same stack size as the
+`},
+		}),
 		NonStage0: attr.nonStage0,
 
 		Env: slices.Concat([]string{