diff --git a/WHATSNEW b/WHATSNEW
index 01cef160f..1c075d716 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -101,6 +101,9 @@ Fixed bugs:
    specify the destDir attribute.
    Bugzilla Report 51947.
 
+ * packagemapper now honors the handleDirSep attribute.
+   Bugzilla Report 51068.
+
 Other changes:
 --------------
 
diff --git a/src/main/org/apache/tools/ant/util/GlobPatternMapper.java b/src/main/org/apache/tools/ant/util/GlobPatternMapper.java
index 61e910d3a..1ba41285c 100644
--- a/src/main/org/apache/tools/ant/util/GlobPatternMapper.java
+++ b/src/main/org/apache/tools/ant/util/GlobPatternMapper.java
@@ -83,6 +83,15 @@ public class GlobPatternMapper implements FileNameMapper {
         this.handleDirSep = handleDirSep;
     }
 
+    /**
+     * Attribute specifying whether to ignore the difference
+     * between / and \ (the two common directory characters).
+     * @since Ant 1.8.3
+     */
+    public boolean getHandleDirSep() {
+        return handleDirSep;
+    }
+
     /**
      * Attribute specifying whether to ignore the case difference
      * in the names.
diff --git a/src/main/org/apache/tools/ant/util/PackageNameMapper.java b/src/main/org/apache/tools/ant/util/PackageNameMapper.java
index bd3344866..2ccde5d14 100644
--- a/src/main/org/apache/tools/ant/util/PackageNameMapper.java
+++ b/src/main/org/apache/tools/ant/util/PackageNameMapper.java
@@ -40,6 +40,9 @@ public class PackageNameMapper extends GlobPatternMapper {
     protected String extractVariablePart(String name) {
         String var = name.substring(prefixLength,
                 name.length() - postfixLength);
+        if (getHandleDirSep()) {
+            var = name.replace('/', '.').replace('\\', '.');
+        }
         return var.replace(File.separatorChar, '.');
     }
 }
diff --git a/src/tests/antunit/types/glob-test.xml b/src/tests/antunit/types/mappers/glob-test.xml
similarity index 98%
rename from src/tests/antunit/types/glob-test.xml
rename to src/tests/antunit/types/mappers/glob-test.xml
index c4626f5dd..c4d92da2d 100644
--- a/src/tests/antunit/types/glob-test.xml
+++ b/src/tests/antunit/types/mappers/glob-test.xml
@@ -20,7 +20,7 @@
          name="glob-test"
          default="antunit">
 
-  <import file="../antunit-base.xml" />
+  <import file="../../antunit-base.xml" />
 
   <target name="setUp">
     <mkdir dir="${input}"/>
diff --git a/src/tests/antunit/types/mappers/packagemapper-test.xml b/src/tests/antunit/types/mappers/packagemapper-test.xml
new file mode 100644
index 000000000..f5cada734
--- /dev/null
+++ b/src/tests/antunit/types/mappers/packagemapper-test.xml
@@ -0,0 +1,36 @@
+<?xml version="1.0"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<project xmlns:au="antlib:org.apache.ant.antunit"
+         default="antunit">
+
+  <import file="../../antunit-base.xml" />
+
+  <target name="testHandleDirSep"
+          description="https://issues.apache.org/bugzilla/show_bug.cgi?id=51086">
+    <pathconvert property="p1">
+      <string>foo/bar</string>
+      <packagemapper from="*" to="*" handledirsep="true"/>
+    </pathconvert>
+    <au:assertPropertyEquals name="p1" value="foo.bar"/>
+    <pathconvert property="p2">
+      <string>foo\bar</string>
+      <packagemapper from="*" to="*" handledirsep="true"/>
+    </pathconvert>
+    <au:assertPropertyEquals name="p1" value="foo.bar"/>
+  </target>
+</project>
\ No newline at end of file