diff --git a/src/core/thread.cpp b/src/core/thread.cpp
index 2d3f72629..07681e6b9 100644
--- a/src/core/thread.cpp
+++ b/src/core/thread.cpp
@@ -115,7 +115,7 @@ void NativeThread::Exit() {
 #else
     // Disable and free the signal stack.
     constexpr stack_t sig_stack = {
-        ss_flags: SS_DISABLE,
+        .ss_flags = SS_DISABLE,
     };
     sigaltstack(&sig_stack, nullptr);
 
@@ -140,11 +140,10 @@ void NativeThread::Initialize() {
     ASSERT_MSG(posix_memalign(&sig_stack_ptr, page_size, sig_stack_size) == 0,
                "Failed to allocate signal stack: {}", errno);
 
-    const stack_t sig_stack = {
-        ss_sp: sig_stack_ptr,
-        ss_size: sig_stack_size,
-        ss_flags: 0,
-    };
+    stack_t sig_stack;
+    sig_stack.ss_sp = sig_stack_ptr;
+    sig_stack.ss_size = sig_stack_size;
+    sig_stack.ss_flags = 0;
     ASSERT_MSG(sigaltstack(&sig_stack, nullptr) == 0, "Failed to set signal stack: {}", errno);
 #endif
 }