diff --git a/system/lib/libc/musl/src/thread/pthread_rwlock_timedwrlock.c b/system/lib/libc/musl/src/thread/pthread_rwlock_timedwrlock.c
index e1d6162f3b1d6..15a8acc1cacf1 100644
--- a/system/lib/libc/musl/src/thread/pthread_rwlock_timedwrlock.c
+++ b/system/lib/libc/musl/src/thread/pthread_rwlock_timedwrlock.c
@@ -5,13 +5,13 @@ int pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct times
 #ifdef __EMSCRIPTEN__
 	/// XXX Emscripten: The spec allows detecting when multiple write locks would deadlock, which we do here to avoid hangs.
 	/// If attempting to lock the write lock that we already own, error out.
-	if (rw->_rw_wr_owner == (int)pthread_self()) return EDEADLK;
+	if (rw->_rw_wr_owner == (void *)pthread_self()) return EDEADLK;
 #endif
 	int r, t;
-	
+
 	r = pthread_rwlock_trywrlock(rw);
 	if (r != EBUSY) return r;
-	
+
 	int spins = 100;
 	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
 
@@ -27,7 +27,7 @@ int pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct times
 #ifdef __EMSCRIPTEN__
 	/// XXX Emscripten: The spec allows detecting when multiple write locks would deadlock, which we do here to avoid hangs.
 	/// Mark this thread as the owner of this write lock.
-	rw->_rw_wr_owner = (int)pthread_self();
+	rw->_rw_wr_owner = (void *)pthread_self();
 #endif
 	return r;
 }
diff --git a/system/lib/libc/musl/src/thread/pthread_rwlock_trywrlock.c b/system/lib/libc/musl/src/thread/pthread_rwlock_trywrlock.c
index fdd08d39dbcc4..cf0f2c648e386 100644
--- a/system/lib/libc/musl/src/thread/pthread_rwlock_trywrlock.c
+++ b/system/lib/libc/musl/src/thread/pthread_rwlock_trywrlock.c
@@ -6,7 +6,7 @@ int pthread_rwlock_trywrlock(pthread_rwlock_t *rw)
 #ifdef __EMSCRIPTEN__
 	/// XXX Emscripten: The spec allows detecting when multiple write locks would deadlock, which we do here to avoid hangs.
 	/// Mark this thread to own the write lock, to ignore multiple attempts to lock.
-	rw->_rw_wr_owner = (int)pthread_self();
+	rw->_rw_wr_owner = (void *)pthread_self();
 #endif
 	return 0;
 }
diff --git a/system/lib/libc/musl/src/thread/pthread_rwlock_unlock.c b/system/lib/libc/musl/src/thread/pthread_rwlock_unlock.c
index 61d5e38646255..15b363dcafc41 100644
--- a/system/lib/libc/musl/src/thread/pthread_rwlock_unlock.c
+++ b/system/lib/libc/musl/src/thread/pthread_rwlock_unlock.c
@@ -7,7 +7,7 @@ int pthread_rwlock_unlock(pthread_rwlock_t *rw)
 #ifdef __EMSCRIPTEN__
 	/// XXX Emscripten: The spec allows detecting when multiple write locks would deadlock, which we do here to avoid hangs.
 	/// Mark this thread to not own the write lock anymore.
-	if (rw->_rw_wr_owner == (int)pthread_self()) rw->_rw_wr_owner = 0;
+	if (rw->_rw_wr_owner == (void *)pthread_self()) rw->_rw_wr_owner = 0;
 #endif
 
 	do {