diff --git a/core/libs/prx/libkernel/Pthread/src/Thread.cpp b/core/libs/prx/libkernel/Pthread/src/Thread.cpp
index ee0f309c5..60f902c82 100644
--- a/core/libs/prx/libkernel/Pthread/src/Thread.cpp
+++ b/core/libs/prx/libkernel/Pthread/src/Thread.cpp
@@ -29,6 +29,7 @@
 static constexpr int SCE_OK = 0;
 
 static constexpr std::size_t DEFAULT_STACK_SIZE = 1u << 20;
+static constexpr std::size_t HOST_STACK_MARGIN = 1u << 20;
 static constexpr int DETACH_DETACHED = 1;
 static constexpr std::size_t THREAD_NAME_CAPACITY = 32;
 
@@ -481,9 +482,9 @@ int APS5_VABI scePthreadCreate(Pthread* thread, const PthreadAttr* attr, Pthread
 #ifdef _WIN32
     SYSTEM_INFO system{};
     GetSystemInfo(&system);
-    const std::size_t nativeStack = (p->stackSize + system.dwPageSize - 1) / system.dwPageSize * system.dwPageSize;
-    if (p->stackSize < 16384 || nativeStack > std::numeric_limits<unsigned>::max())
+    if (p->stackSize < 16384 || p->stackSize > std::numeric_limits<unsigned>::max() - HOST_STACK_MARGIN - system.dwPageSize)
         throw std::runtime_error("scePthreadCreate: invalid Windows stack size");
+    const std::size_t nativeStack = (p->stackSize + HOST_STACK_MARGIN + system.dwPageSize - 1) / system.dwPageSize * system.dwPageSize;
     auto native = std::make_unique<NativeThreadArgs>(NativeThreadArgs{std::move(args), start.get_future(), {}});
     auto initialized = native->initialized.get_future();
     const auto handle = _beginthreadex(nullptr, static_cast<unsigned>(nativeStack), StartNativeThread, native.get(), 0, nullptr);
@@ -507,9 +508,9 @@ int APS5_VABI scePthreadCreate(Pthread* thread, const PthreadAttr* attr, Pthread
 #else
     const auto reserve = HostStackReserve();
     const auto page = static_cast<std::size_t>(sysconf(_SC_PAGESIZE));
-    if (p->stackSize < 16384 || p->stackSize > std::numeric_limits<std::size_t>::max() - reserve - page)
+    if (p->stackSize < 16384 || p->stackSize > std::numeric_limits<std::size_t>::max() - reserve - HOST_STACK_MARGIN - page)
         throw std::runtime_error("scePthreadCreate: invalid stack size");
-    const std::size_t nativeStack = (p->stackSize + reserve + page - 1) / page * page;
+    const std::size_t nativeStack = (p->stackSize + reserve + HOST_STACK_MARGIN + page - 1) / page * page;
     auto native = std::make_unique<NativeThreadArgs>(NativeThreadArgs{std::move(args), start.get_future(), {}});
     auto initialized = native->initialized.get_future();
     pthread_attr_t nativeAttr;
diff --git a/core/libs/tests/GuestPthreadStack.cpp b/core/libs/tests/GuestPthreadStack.cpp
index 1a0f7bb62..21045925e 100644
--- a/core/libs/tests/GuestPthreadStack.cpp
+++ b/core/libs/tests/GuestPthreadStack.cpp
@@ -17,6 +17,7 @@ Pthread APS5_VABI scePthreadSelf();
 static constexpr int SCE_OK = 0;
 static constexpr std::size_t FRAME_SIZE = 4096;
 static constexpr std::size_t FRAME_MARGIN = 2 * FRAME_SIZE;
+static constexpr std::size_t HOST_CALL_STACK = 256 * 1024;
 static constexpr std::size_t STACK_SIZES[] = {16384, 65536, 1u << 20, 16u << 20};
 
 thread_local unsigned char threadLocalBlock[512 * 1024];
@@ -56,6 +57,8 @@ static void* APS5_VABI Worker(void* arg) {
     Require(local - begin + FRAME_SIZE >= requested);
     const auto deepest = Descend(begin);
     Require(deepest >= begin && deepest < begin + FRAME_MARGIN);
+    const auto hostDeepest = descend(begin - HOST_CALL_STACK);
+    Require(hostDeepest < begin - HOST_CALL_STACK + FRAME_MARGIN);
 
     Require(threadLocalBlock[0] == 1 && threadLocalBlock[sizeof(threadLocalBlock) - 1] == 2);
     return arg;