diff --git a/test/syscalls/linux/BUILD b/test/syscalls/linux/BUILD
index 7b91d7669..b596aa73b 100644
--- a/test/syscalls/linux/BUILD
+++ b/test/syscalls/linux/BUILD
@@ -1826,6 +1826,7 @@ cc_binary(
         "//test/util:mount_util",
         "@com_google_absl//absl/algorithm:container",
         "@com_google_absl//absl/container:btree",
+        "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_absl//absl/container:node_hash_set",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:str_format",
diff --git a/test/syscalls/linux/proc.cc b/test/syscalls/linux/proc.cc
index 3c2187665..78edcf186 100644
--- a/test/syscalls/linux/proc.cc
+++ b/test/syscalls/linux/proc.cc
@@ -51,6 +51,7 @@
 #include "gtest/gtest.h"
 #include "absl/algorithm/container.h"
 #include "absl/container/btree_map.h"
+#include "absl/container/flat_hash_set.h"
 #include "absl/container/node_hash_set.h"
 #include "absl/strings/ascii.h"
 #include "absl/strings/match.h"
@@ -1169,7 +1170,7 @@ static void CheckFdDirGetdentsDuplicates(const std::string& path) {
   EXPECT_GE(newfd, 1024);
   auto fd_closer = Cleanup([newfd]() { close(newfd); });
   auto fd_files = ASSERT_NO_ERRNO_AND_VALUE(ListDir(path.c_str(), false));
-  absl::node_hash_set<std::string> fd_files_dedup(fd_files.begin(),
+  absl::flat_hash_set<std::string> fd_files_dedup(fd_files.begin(),
                                                   fd_files.end());
   EXPECT_EQ(fd_files.size(), fd_files_dedup.size());
 }
@@ -2673,7 +2674,7 @@ void CheckDuplicatesRecursively(std::string path) {
       return;
     }
     auto dir_closer = Cleanup([&dir]() { closedir(dir); });
-    absl::node_hash_set<std::string> children;
+    absl::flat_hash_set<std::string> children;
     while (true) {
       // Readdir(3): If the end of the directory stream is reached, NULL is
       // returned and errno is not changed.  If an error occurs, NULL is