diff --git a/include/posix/sys/eventfd.h b/include/posix/sys/eventfd.h
index 5b0388e5e64..efce22b8ae6 100644
--- a/include/posix/sys/eventfd.h
+++ b/include/posix/sys/eventfd.h
@@ -7,6 +7,7 @@
 #ifndef ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
 #define ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
 
+#include <zephyr.h>
 #include <sys/fdtable.h>
 #include <sys/types.h>
 
@@ -53,13 +54,18 @@ int eventfd(unsigned int initval, int flags);
 static inline int eventfd_read(int fd, eventfd_t *value)
 {
 	const struct fd_op_vtable *efd_vtable;
+	struct k_mutex *lock;
 	ssize_t ret;
 	void *obj;
 
-	obj = z_get_fd_obj_and_vtable(fd, &efd_vtable);
+	obj = z_get_fd_obj_and_vtable(fd, &efd_vtable, &lock);
+
+	(void)k_mutex_lock(lock, K_FOREVER);
 
 	ret = efd_vtable->read(obj, value, sizeof(*value));
 
+	k_mutex_unlock(lock);
+
 	return ret == sizeof(eventfd_t) ? 0 : -1;
 }
 
@@ -74,13 +80,18 @@ static inline int eventfd_read(int fd, eventfd_t *value)
 static inline int eventfd_write(int fd, eventfd_t value)
 {
 	const struct fd_op_vtable *efd_vtable;
+	struct k_mutex *lock;
 	ssize_t ret;
 	void *obj;
 
-	obj = z_get_fd_obj_and_vtable(fd, &efd_vtable);
+	obj = z_get_fd_obj_and_vtable(fd, &efd_vtable, &lock);
+
+	(void)k_mutex_lock(lock, K_FOREVER);
 
 	ret = efd_vtable->write(obj, &value, sizeof(value));
 
+	k_mutex_unlock(lock);
+
 	return ret == sizeof(eventfd_t) ? 0 : -1;
 }