diff --git a/orbis-kernel/include/orbis/thread/ProcessOps.hpp b/orbis-kernel/include/orbis/thread/ProcessOps.hpp
index 71e420261..161f74abd 100644
--- a/orbis-kernel/include/orbis/thread/ProcessOps.hpp
+++ b/orbis-kernel/include/orbis/thread/ProcessOps.hpp
@@ -40,7 +40,7 @@ struct ProcessOps {
   SysResult (*dynlib_unload_prx)(Thread *thread, ModuleHandle handle);
 
   SysResult (*thr_create)(Thread *thread, ptr<struct ucontext> ctxt, ptr<slong> arg, sint flags);
-  SysResult (*thr_new)(Thread *thread, ptr<struct thr_param> param, sint param_size);
+  SysResult (*thr_new)(Thread *thread, ptr<thr_param> param, sint param_size);
   SysResult (*thr_exit)(Thread *thread, ptr<slong> state);
   SysResult (*thr_kill)(Thread *thread, slong id, sint sig);
   SysResult (*thr_kill2)(Thread *thread, pid_t pid, slong id, sint sig);
diff --git a/orbis-kernel/include/orbis/thread/Thread.hpp b/orbis-kernel/include/orbis/thread/Thread.hpp
index 1ad22abc5..5dce313c5 100644
--- a/orbis-kernel/include/orbis/thread/Thread.hpp
+++ b/orbis-kernel/include/orbis/thread/Thread.hpp
@@ -26,5 +26,9 @@ struct Thread {
 
   lwpid_t tid = -1;
   ThreadState state = ThreadState::INACTIVE;
+
+  // FIXME: implement thread destruction
+  void incRef() {}
+  void decRef() {}
 };
 } // namespace orbis
diff --git a/orbis-kernel/include/orbis/thread/types.hpp b/orbis-kernel/include/orbis/thread/types.hpp
index 7f632162a..66cd6413e 100644
--- a/orbis-kernel/include/orbis/thread/types.hpp
+++ b/orbis-kernel/include/orbis/thread/types.hpp
@@ -6,4 +6,22 @@ using lwpid_t = int32_t;
 using pid_t = int64_t;
 using uid_t = uint32_t;
 using gid_t = uint32_t;
+
+struct rtprio {
+  uint16_t type;
+  uint16_t prio;
+};
+
+struct thr_param {
+	ptr<void(void *)> start_func;
+	ptr<void> arg;
+	ptr<char> stack_base;
+	size_t stack_size;
+	ptr<char> tls_base;
+	size_t tls_size;
+	ptr<slong> child_tid; // Address to store the new thread identifier, for the child's use
+	ptr<slong> parent_tid; // Address to store the new thread identifier, for the parent's use
+	sint flags; // Thread	creation flags. The flags member may specify the following flags:
+	ptr<rtprio> rtp; // Real-time scheduling priority for the new thread. May be NULL to inherit the priority from the creating	thread
+};
 } // namespace orbis
diff --git a/orbis-kernel/include/orbis/utils/Rc.hpp b/orbis-kernel/include/orbis/utils/Rc.hpp
index bff611f60..7f8cc7eb0 100644
--- a/orbis-kernel/include/orbis/utils/Rc.hpp
+++ b/orbis-kernel/include/orbis/utils/Rc.hpp
@@ -52,7 +52,9 @@ public:
   template <typename OT>
     requires(std::is_base_of_v<T, OT>)
   Ref(OT *ref) : m_ref(ref) {
-    ref->incRef();
+    if (m_ref != nullptr) {
+      ref->incRef();
+    }
   }
 
   template <typename OT>