diff --git a/include/xgboost/collective/poll_utils.h b/include/xgboost/collective/poll_utils.h
index 41b674964..0e012d2b5 100644
--- a/include/xgboost/collective/poll_utils.h
+++ b/include/xgboost/collective/poll_utils.h
@@ -35,7 +35,7 @@
 
 #if !defined(_WIN32)
 
-#include <sys/poll.h>
+#include <poll.h>
 
 using SOCKET = int;
 using sock_size_t = size_t;  // NOLINT
diff --git a/src/common/io.cc b/src/common/io.cc
index 4bc8d9de4..a83c1da3c 100644
--- a/src/common/io.cc
+++ b/src/common/io.cc
@@ -4,7 +4,7 @@
 #if defined(__unix__) || defined(__APPLE__)
 
 #include <fcntl.h>     // for open, O_RDONLY
-#include <sys/mman.h>  // for mmap, mmap64, munmap, madvise
+#include <sys/mman.h>  // for mmap, munmap, madvise
 #include <unistd.h>    // for close, getpagesize
 
 #else
@@ -202,7 +202,7 @@ MMAPFile* detail::OpenMmap(std::string path, std::size_t offset, std::size_t len
 
 #if defined(__linux__) || defined(__GLIBC__)
   int prot{PROT_READ};
-  ptr = reinterpret_cast<std::byte*>(mmap64(nullptr, view_size, prot, MAP_PRIVATE, fd, view_start));
+  ptr = reinterpret_cast<std::byte*>(mmap(nullptr, view_size, prot, MAP_PRIVATE, fd, view_start));
   CHECK_NE(ptr, MAP_FAILED) << "Failed to map: " << path << ". " << SystemErrorMsg();
   auto handle = new MMAPFile{fd, ptr, view_size, offset - view_start, std::move(path)};
 #elif defined(xgboost_IS_WIN)