diff --git a/src/core/libraries/kernel/threads/pthread.cpp b/src/core/libraries/kernel/threads/pthread.cpp
index 08886c6eb..372f05bff 100644
--- a/src/core/libraries/kernel/threads/pthread.cpp
+++ b/src/core/libraries/kernel/threads/pthread.cpp
@@ -327,7 +327,7 @@ void PS4_SYSV_ABI sched_yield() {
     std::this_thread::yield();
 }
 
-int PS4_SYSV_ABI posix_pthread_once(PthreadOnce* once_control, void (*init_routine)()) {
+int PS4_SYSV_ABI posix_pthread_once(PthreadOnce* once_control, void PS4_SYSV_ABI (*init_routine)()) {
     for (;;) {
         auto state = once_control->state.load();
         if (state == PthreadOnceState::Done) {