diff --git a/src/tests/junit/org/apache/tools/ant/taskdefs/ReplaceTest.java b/src/tests/junit/org/apache/tools/ant/taskdefs/ReplaceTest.java
index cf8cea714..9eedf44d5 100644
--- a/src/tests/junit/org/apache/tools/ant/taskdefs/ReplaceTest.java
+++ b/src/tests/junit/org/apache/tools/ant/taskdefs/ReplaceTest.java
@@ -79,7 +79,7 @@ public class ReplaceTest extends BuildFileTest {
         executeTarget("lastModifiedSetup");
         String tmpdir = project.getProperty("tmp.dir");
         long ts1 = new File(tmpdir, "test.txt").lastModified();
-        Thread.sleep(2);
+        Thread.sleep(3000);
         executeTarget("testNoPreserve");
         assertTrue(ts1 < new File(tmpdir, "test.txt").lastModified());
     }
@@ -88,7 +88,7 @@ public class ReplaceTest extends BuildFileTest {
         executeTarget("lastModifiedSetup");
         String tmpdir = project.getProperty("tmp.dir");
         long ts1 = new File(tmpdir, "test.txt").lastModified();
-        Thread.sleep(2);
+        Thread.sleep(3000);
         executeTarget("testPreserve");
         assertTrue(ts1 == new File(tmpdir, "test.txt").lastModified());
     }
diff --git a/src/tests/junit/org/apache/tools/ant/taskdefs/optional/ReplaceRegExpTest.java b/src/tests/junit/org/apache/tools/ant/taskdefs/optional/ReplaceRegExpTest.java
index 42bafedaa..fa84e9569 100644
--- a/src/tests/junit/org/apache/tools/ant/taskdefs/optional/ReplaceRegExpTest.java
+++ b/src/tests/junit/org/apache/tools/ant/taskdefs/optional/ReplaceRegExpTest.java
@@ -106,7 +106,7 @@ public class ReplaceRegExpTest extends BuildFileTest {
         executeTarget("lastModifiedSetup");
         String tmpdir = project.getProperty("tmpregexp");
         long ts1 = new File(tmpdir, "test.txt").lastModified();
-        Thread.sleep(2);
+        Thread.sleep(3000);
         executeTarget("testNoPreserve");
         assertTrue(ts1 < new File(tmpdir, "test.txt").lastModified());
     }
@@ -115,7 +115,7 @@ public class ReplaceRegExpTest extends BuildFileTest {
         executeTarget("lastModifiedSetup");
         String tmpdir = project.getProperty("tmpregexp");
         long ts1 = new File(tmpdir, "test.txt").lastModified();
-        Thread.sleep(2);
+        Thread.sleep(3000);
         executeTarget("testPreserve");
         assertTrue(ts1 == new File(tmpdir, "test.txt").lastModified());
     }