diff --git a/test/posix-mock-test.cc b/test/posix-mock-test.cc
index 521eb035..a8eb1829 100644
--- a/test/posix-mock-test.cc
+++ b/test/posix-mock-test.cc
@@ -34,6 +34,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <climits>
+#include <memory>
 
 #ifdef _WIN32
 # include <io.h>
@@ -247,11 +248,11 @@ TEST(FileTest, OpenRetry) {
 TEST(FileTest, CloseNoRetryInDtor) {
   File read_end, write_end;
   File::pipe(read_end, write_end);
-  File *f = new File(std::move(read_end));
+  std::auto_ptr<File> f(new File(std::move(read_end)));
   int saved_close_count = 0;
   EXPECT_WRITE(stderr, {
     close_count = 1;
-    delete f;
+    f.reset();
     saved_close_count = close_count;
     close_count = 0;
   }, format_system_error(EINTR, "cannot close file") + "\n");
diff --git a/test/posix-test.cc b/test/posix-test.cc
index 4a9db7e3..10f92d72 100644
--- a/test/posix-test.cc
+++ b/test/posix-test.cc
@@ -26,6 +26,7 @@
  */
 
 #include <cstring>
+#include <memory>
 
 #include "gtest-extra.h"
 #include "posix.h"
@@ -136,14 +137,14 @@ TEST(BufferedFileTest, CloseFileInDtor) {
 }
 
 TEST(BufferedFileTest, CloseErrorInDtor) {
-  BufferedFile *f = new BufferedFile(open_buffered_file());
+  std::auto_ptr<BufferedFile> f(new BufferedFile(open_buffered_file()));
   EXPECT_WRITE(stderr, {
       // The close function must be called inside EXPECT_WRITE, otherwise
       // the system may recycle closed file descriptor when redirecting the
       // output in EXPECT_STDERR and the second close will break output
       // redirection.
       FMT_POSIX(close(f->fileno()));
-      SUPPRESS_ASSERT(delete f);
+      SUPPRESS_ASSERT(f.reset());
   }, format_system_error(EBADF, "cannot close file") + "\n");
 }