diff --git a/tink/util/istream_input_stream_test.cc b/tink/util/istream_input_stream_test.cc
index de5c44ff..a3e69e3c 100644
--- a/tink/util/istream_input_stream_test.cc
+++ b/tink/util/istream_input_stream_test.cc
@@ -54,7 +54,7 @@ std::unique_ptr<std::istream> GetTestIstream(absl::string_view filename,
   std::ofstream output (full_filename, std::ofstream::binary);
   if (!output.write(file_contents->data(), size) || output.tellp() != size) {
     std::clog << "Failed to write " << size << " bytes to file "
-              << full_filename << " error: " << errno << std::endl;
+              << full_filename << " error: " << errno << '\n';
 
     exit(1);
   }
diff --git a/tink/util/test_util.cc b/tink/util/test_util.cc
index 57969cc3..421bc054 100644
--- a/tink/util/test_util.cc
+++ b/tink/util/test_util.cc
@@ -77,7 +77,7 @@ std::string ReadTestFile(absl::string_view filename) {
   std::string full_filename = absl::StrCat(test::TmpDir(), "/", filename);
   std::ifstream input_stream(full_filename, std::ios::binary);
   if (!input_stream) {
-    std::clog << "Cannot open file " << full_filename << std::endl;
+    std::clog << "Cannot open file " << full_filename << '\n';
     exit(1);
   }
   std::stringstream buffer;