diff --git a/src/etc/testcases/taskdefs/jar.xml b/src/etc/testcases/taskdefs/jar.xml
index 46ac4f5b6..2eaee82a9 100644
--- a/src/etc/testcases/taskdefs/jar.xml
+++ b/src/etc/testcases/taskdefs/jar.xml
@@ -200,4 +200,12 @@
     <mkdir dir="${tmp.dir}"/>
     <unzip src="${tmp.jar}" dest="${tmp.dir}"/>
   </target>
+
+  <!-- bug 10262 -->
+  <target name="testNoDuplicateIndex">
+    <mkdir dir="${tmp.dir}/META-INF"/>
+    <touch file="${tmp.dir}/META-INF/INDEX.LIST"/>
+    <touch file="${tmp.dir}/foo"/>
+    <jar destfile="${tmp.jar}" index="yes" basedir="${tmp.dir}"/>
+  </target>
 </project>
diff --git a/src/testcases/org/apache/tools/ant/taskdefs/JarTest.java b/src/testcases/org/apache/tools/ant/taskdefs/JarTest.java
index b4c9fafc7..fb51ecb49 100644
--- a/src/testcases/org/apache/tools/ant/taskdefs/JarTest.java
+++ b/src/testcases/org/apache/tools/ant/taskdefs/JarTest.java
@@ -59,6 +59,9 @@ import java.io.FileReader;
 import java.io.IOException;
 import java.io.Reader;
 import java.util.Date;
+import java.util.Enumeration;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
 import org.apache.tools.ant.BuildFileTest;
 
 /**
@@ -226,4 +229,18 @@ public class JarTest extends BuildFileTest {
         File jarXml = getProject().resolveFile(tempDir + "jar.xml");
         assertTrue(jarXml.exists());
     }
+
+    public void testNoDuplicateIndex() throws IOException {
+        executeTarget("testNoDuplicateIndex");
+        ZipFile archive = new ZipFile(getProject().resolveFile(tempJar));
+        Enumeration enum = archive.entries();
+        int numberOfIndexLists = 0;
+        while (enum.hasMoreElements()) {
+            ZipEntry ze = (ZipEntry) enum.nextElement();
+            if (ze.getName().equals("META-INF/INDEX.LIST")) {
+                numberOfIndexLists++;
+            }
+        }
+        assertEquals(1, numberOfIndexLists);
+    }
 }