--- a/third_party/pfs/src/mem.cpp
+++ b/third_party/pfs/src/mem.cpp
@@ -51,7 +51,7 @@
 
     struct iovec iov = {&buffer[0], buffer.size()};
 
-    ssize_t bytes_read = preadv64(_fd, &iov, 1, offset);
+    ssize_t bytes_read = preadv(_fd, &iov, 1, offset);
     if (bytes_read == -1)
     {
         throw std::system_error(errno, std::system_category(),
--- a/third_party/pfs/test/test_utils.hpp
+++ b/third_party/pfs/test/test_utils.hpp
@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <sys/types.h>
 
 #include <linux/kdev_t.h>