diff --git a/util/src/test/java/io/grpc/util/AdvancedTlsX509TrustManagerTest.java b/util/src/test/java/io/grpc/util/AdvancedTlsX509TrustManagerTest.java
index 5ad0e85fa3..228dbf5ea5 100644
--- a/util/src/test/java/io/grpc/util/AdvancedTlsX509TrustManagerTest.java
+++ b/util/src/test/java/io/grpc/util/AdvancedTlsX509TrustManagerTest.java
@@ -168,7 +168,7 @@ public class AdvancedTlsX509TrustManagerTest {
     fakeClock.forwardTime(1, TimeUnit.MINUTES);
     assertArrayEquals(serverCert0, trustManager.getAcceptedIssuers());
 
-    serverCert0File.setLastModified(serverCert0File.lastModified() - 10);
+    serverCert0File.setLastModified(serverCert0File.lastModified() - 2000);
 
     fakeClock.forwardTime(1, TimeUnit.MINUTES);
     assertArrayEquals(serverCert0, trustManager.getAcceptedIssuers());
@@ -181,7 +181,7 @@ public class AdvancedTlsX509TrustManagerTest {
     fakeClock.forwardTime(1, TimeUnit.MINUTES);
     assertArrayEquals(serverCert0, trustManager.getAcceptedIssuers());
 
-    serverCert0File.setLastModified(beforeModify + 10);
+    serverCert0File.setLastModified(beforeModify + 2000);
 
     // file modification time changed
     fakeClock.forwardTime(1, TimeUnit.MINUTES);