diff --git a/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdErrCaptureRuleTest.java b/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdErrCaptureRuleTest.java
index 43a1503f2e..565bb08f12 100644
--- a/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdErrCaptureRuleTest.java
+++ b/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdErrCaptureRuleTest.java
@@ -29,7 +29,7 @@ public class StdErrCaptureRuleTest {
   @Test
   public void captureSuccessful() {
     System.err.println("err world");
-    String expected = "err world\n";
+    String expected = "err world" + System.lineSeparator();
     String actual = stdOutCap.getCapturedOutputAsUtf8String();
     assertEquals(expected, actual);
   }
diff --git a/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdOutCaptureRuleTest.java b/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdOutCaptureRuleTest.java
index 35163a31f7..8230debded 100644
--- a/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdOutCaptureRuleTest.java
+++ b/google-cloud-core/src/test/java/com/google/cloud/testing/junit4/tests/StdOutCaptureRuleTest.java
@@ -29,7 +29,7 @@ public class StdOutCaptureRuleTest {
   @Test
   public void captureSuccessful() {
     System.out.println("hello world");
-    String expected = "hello world\n";
+    String expected = "hello world" + System.lineSeparator();
     String actual = stdOutCap.getCapturedOutputAsUtf8String();
     assertEquals(expected, actual);
   }