diff --git a/src/etc/testcases/taskdefs/unzip.xml b/src/etc/testcases/taskdefs/unzip.xml
index 61e42c92c..824cf55a8 100644
--- a/src/etc/testcases/taskdefs/unzip.xml
+++ b/src/etc/testcases/taskdefs/unzip.xml
@@ -4,6 +4,9 @@
 
   <target name="cleanup">
     <delete file="asf-logo.gif" />
+    <delete file="unziptest.zip"/>
+    <delete dir="unziptestin"/>
+    <delete dir="unziptestout"/>
   </target>
 
   <target name="test1">
@@ -28,4 +31,36 @@
     <unzip src="expected/asf-logo.gif.zip" dest="." />
   </target>
 
+  <target name="prepareTestZip">
+    <mkdir dir="unziptestin/1"/>
+    <mkdir dir="unziptestin/2"/>
+    <touch file="unziptestin/1/foo"/>
+    <touch file="unziptestin/2/bar"/>
+    <zip destfile="unziptest.zip" basedir="unziptestin"/>
+  </target>
+
+  <target name="testPatternSetExcludeOnly" depends="prepareTestZip">
+    <unzip dest="unziptestout" src="unziptest.zip">
+      <patternset>
+        <exclude name="1/**"/>
+      </patternset>
+    </unzip>
+  </target>
+
+  <target name="testPatternSetIncludeOnly" depends="prepareTestZip">
+    <unzip dest="unziptestout" src="unziptest.zip">
+      <patternset>
+        <include name="2/**"/>
+      </patternset>
+    </unzip>
+  </target>
+
+  <target name="testPatternSetIncludeAndExclude" depends="prepareTestZip">
+    <unzip dest="unziptestout" src="unziptest.zip">
+      <patternset>
+        <include name="2/**"/>
+        <exclude name="2/**"/>
+      </patternset>
+    </unzip>
+  </target>
 </project>
diff --git a/src/main/org/apache/tools/ant/taskdefs/Expand.java b/src/main/org/apache/tools/ant/taskdefs/Expand.java
index 1e2286fc1..523708918 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Expand.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Expand.java
@@ -182,17 +182,25 @@ public class Expand extends Task {
             String name = entryName;
             boolean included = false;
             for (int v = 0; v < patternsets.size(); v++) {
-                included = true;
                 PatternSet p = (PatternSet) patternsets.elementAt(v);
                 String[] incls = p.getIncludePatterns(getProject());
-                if (incls != null) {
-                    for (int w = 0; w < incls.length; w++) {
-                        included = DirectoryScanner.match(incls[w], name);
-                        if (included) {
-                            break;
-                        }
+                if (incls == null || incls.length == 0) {
+                    // no include pattern implicitly means includes="**"
+                    incls = new String[] {"**"};
+                }
+                    
+                for (int w = 0; w < incls.length; w++) {
+                    included = DirectoryScanner.match(incls[w], name);
+                    if (included) {
+                        break;
                     }
                 }
+                
+                if (!included) {
+                    break;
+                }
+                
+
                 String[] excls = p.getExcludePatterns(getProject());
                 if (excls != null) {
                     for (int w = 0; w < excls.length; w++) {
diff --git a/src/testcases/org/apache/tools/ant/taskdefs/UnzipTest.java b/src/testcases/org/apache/tools/ant/taskdefs/UnzipTest.java
index aedaa19c3..cc276ff49 100644
--- a/src/testcases/org/apache/tools/ant/taskdefs/UnzipTest.java
+++ b/src/testcases/org/apache/tools/ant/taskdefs/UnzipTest.java
@@ -1,7 +1,7 @@
 /*
  * The Apache Software License, Version 1.1
  *
- * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
+ * Copyright (c) 2000-2001,2003 The Apache Software Foundation.  All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -101,4 +101,37 @@ public class UnzipTest extends BuildFileTest {
                                            project.resolveFile("asf-logo.gif")));
     }
     
+    /*
+     * PR 11100
+     */
+    public void testPatternSetExcludeOnly() {
+        executeTarget("testPatternSetExcludeOnly");
+        assertTrue("1/foo is excluded",
+                   !getProject().resolveFile("unziptestout/1/foo").exists());
+        assertTrue("2/bar is not excluded",
+                   getProject().resolveFile("unziptestout/2/bar").exists());
+    }
+
+    /*
+     * PR 11100
+     */
+    public void testPatternSetIncludeOnly() {
+        executeTarget("testPatternSetIncludeOnly");
+        assertTrue("1/foo is not included",
+                   !getProject().resolveFile("unziptestout/1/foo").exists());
+        assertTrue("2/bar is included",
+                   getProject().resolveFile("unziptestout/2/bar").exists());
+    }
+
+    /*
+     * PR 11100
+     */
+    public void testPatternSetIncludeAndExclude() {
+        executeTarget("testPatternSetIncludeAndExclude");
+        assertTrue("1/foo is not included",
+                   !getProject().resolveFile("unziptestout/1/foo").exists());
+        assertTrue("2/bar is excluded",
+                   !getProject().resolveFile("unziptestout/2/bar").exists());
+    }
+
 }