diff --git a/core/libs/prx/libkernel/CMakeLists.txt b/core/libs/prx/libkernel/CMakeLists.txt
index 2520ab4772f..e898d2146d2 100644
--- a/core/libs/prx/libkernel/CMakeLists.txt
+++ b/core/libs/prx/libkernel/CMakeLists.txt
@@ -210,6 +210,16 @@ if(BUILD_TESTING)
         set_tests_properties(guest_cond_timedwait PROPERTIES ENVIRONMENT_MODIFICATION
             "PATH=path_list_prepend:$<TARGET_FILE_DIR:libkernel>")
     endif()
+    add_test_executable(guest_condattr_setclock_tests ${LIBS_INCLUDE_DIR}/tests/GuestCondattrSetclock.cpp)
+    target_include_directories(guest_condattr_setclock_tests PRIVATE ${LIBS_INCLUDE_DIR})
+    target_link_libraries(guest_condattr_setclock_tests PRIVATE libkernel libc)
+    configure_windows_unwind(guest_condattr_setclock_tests)
+    add_test(NAME guest_condattr_setclock COMMAND guest_condattr_setclock_tests)
+    set_tests_properties(guest_condattr_setclock PROPERTIES TIMEOUT 20)
+    if(WIN32)
+        set_tests_properties(guest_condattr_setclock PROPERTIES ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:libkernel>")
+    endif()
     add_test_executable(guest_cpu_time_clocks_tests ${LIBS_INCLUDE_DIR}/tests/GuestCpuTimeClocks.cpp)
     target_include_directories(guest_cpu_time_clocks_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(guest_cpu_time_clocks_tests PRIVATE libkernel libc)
diff --git a/core/libs/prx/libkernel/Pthread/Posix/Cond.cpp b/core/libs/prx/libkernel/Pthread/Posix/Cond.cpp
index b9a7b211cc5..a31fe550208 100644
--- a/core/libs/prx/libkernel/Pthread/Posix/Cond.cpp
+++ b/core/libs/prx/libkernel/Pthread/Posix/Cond.cpp
@@ -57,6 +57,7 @@ int APS5_VABI pthread_condattr_init_nid_postfix(PthreadCondattr* attr) {
 
 int APS5_VABI pthread_condattr_setclock_nid_postfix(PthreadCondattr* attr, KernelClockid clock_id) {
     if (!attr || !*attr) return PosixThread::GUEST_EINVAL;
+    if (clock_id != 0 && clock_id != 1 && clock_id != 2 && clock_id != 4) return PosixThread::GUEST_EINVAL;
     return toPosix(scePthreadCondattrSetclock(attr, clock_id));
 }
 
diff --git a/core/libs/tests/GuestCondattrSetclock.cpp b/core/libs/tests/GuestCondattrSetclock.cpp
new file mode 100644
index 00000000000..6abbc3f190c
--- /dev/null
+++ b/core/libs/tests/GuestCondattrSetclock.cpp
@@ -0,0 +1,75 @@
+#include "SceTypes.hpp"
+#include <climits>
+#include <cstdio>
+#include <initializer_list>
+#include <cstdlib>
+
+extern "C" {
+int APS5_VABI pthread_condattr_init_nid_postfix(PthreadCondattr* attr);
+int APS5_VABI pthread_condattr_destroy_nid_postfix(PthreadCondattr* attr);
+int APS5_VABI pthread_condattr_setclock_nid_postfix(PthreadCondattr* attr, KernelClockid clockId);
+int APS5_VABI pthread_cond_init_nid_postfix(PthreadCond* cond, const PthreadCondattr* attr);
+int APS5_VABI pthread_cond_destroy_nid_postfix(PthreadCond* cond);
+int APS5_VABI pthread_cond_timedwait_nid_postfix(PthreadCond* cond, PthreadMutex* mutex, const KernelTimespec* abstime);
+int APS5_VABI pthread_mutex_init_nid_postfix(PthreadMutex* mutex, const PthreadMutexattr* attr);
+int APS5_VABI pthread_mutex_destroy_nid_postfix(PthreadMutex* mutex);
+int APS5_VABI pthread_mutex_lock_nid_postfix(PthreadMutex* mutex);
+int APS5_VABI pthread_mutex_unlock_nid_postfix(PthreadMutex* mutex);
+int APS5_VABI clock_gettime_nid_postfix(KernelClockid clockId, KernelTimespec* tp);
+int* APS5_VABI __error_nid_postfix();
+}
+
+static constexpr int GUEST_EINVAL = 22;
+static constexpr int GUEST_ETIMEDOUT = 60;
+static constexpr int GUEST_EINTR = 4;
+
+static void RequireResult(const char* operation, int actual, int expected) {
+    if (actual != expected) {
+        std::fprintf(stderr, "%s: expected %d, got %d\n", operation, expected, actual);
+        std::abort();
+    }
+}
+
+static void RequireGuestErrno(const char* operation, int expected) {
+    const int actual = *__error_nid_postfix();
+    if (actual != expected) {
+        std::fprintf(stderr, "%s changed guest errno: expected %d, got %d\n", operation, expected, actual);
+        std::abort();
+    }
+}
+
+int main() {
+    PthreadCondattr attr = nullptr;
+    RequireResult("pthread_condattr_setclock null pointer", pthread_condattr_setclock_nid_postfix(nullptr, 4), GUEST_EINVAL);
+    RequireResult("pthread_condattr_setclock null attribute", pthread_condattr_setclock_nid_postfix(&attr, 4), GUEST_EINVAL);
+    RequireResult("pthread_condattr_init", pthread_condattr_init_nid_postfix(&attr), 0);
+
+    for (const KernelClockid clockId : {0, 1, 2, 4}) {
+        *__error_nid_postfix() = GUEST_EINTR;
+        RequireResult("pthread_condattr_setclock valid clock", pthread_condattr_setclock_nid_postfix(&attr, clockId), 0);
+        RequireGuestErrno("pthread_condattr_setclock valid clock", GUEST_EINTR);
+    }
+
+    const KernelClockid invalidClockIds[] = {3, 5, -1, INT_MAX};
+    for (const KernelClockid clockId : invalidClockIds) {
+        *__error_nid_postfix() = GUEST_EINTR;
+        RequireResult("pthread_condattr_setclock invalid clock", pthread_condattr_setclock_nid_postfix(&attr, clockId), GUEST_EINVAL);
+        RequireGuestErrno("pthread_condattr_setclock invalid clock", GUEST_EINTR);
+    }
+
+    PthreadCond cond = nullptr;
+    PthreadMutex mutex = nullptr;
+    RequireResult("pthread_cond_init", pthread_cond_init_nid_postfix(&cond, &attr), 0);
+    RequireResult("pthread_mutex_init", pthread_mutex_init_nid_postfix(&mutex, nullptr), 0);
+    RequireResult("pthread_mutex_lock", pthread_mutex_lock_nid_postfix(&mutex), 0);
+
+    KernelTimespec deadline{};
+    RequireResult("clock_gettime monotonic", clock_gettime_nid_postfix(4, &deadline), 0);
+    RequireResult("pthread_cond_timedwait expired monotonic deadline", pthread_cond_timedwait_nid_postfix(&cond, &mutex, &deadline), GUEST_ETIMEDOUT);
+
+    RequireResult("pthread_mutex_unlock", pthread_mutex_unlock_nid_postfix(&mutex), 0);
+    RequireResult("pthread_cond_destroy", pthread_cond_destroy_nid_postfix(&cond), 0);
+    RequireResult("pthread_mutex_destroy", pthread_mutex_destroy_nid_postfix(&mutex), 0);
+    RequireResult("pthread_condattr_destroy", pthread_condattr_destroy_nid_postfix(&attr), 0);
+    RequireResult("pthread_condattr_setclock destroyed attribute", pthread_condattr_setclock_nid_postfix(&attr, 4), GUEST_EINVAL);
+}