diff --git a/src/main/org/apache/tools/ant/Project.java b/src/main/org/apache/tools/ant/Project.java
index d108fe47a..d588225d2 100644
--- a/src/main/org/apache/tools/ant/Project.java
+++ b/src/main/org/apache/tools/ant/Project.java
@@ -822,7 +822,7 @@ public class Project implements ResourceFactory {
         this.baseDir = baseDir;
         setPropertyInternal(MagicNames.PROJECT_BASEDIR, this.baseDir.getPath());
         String msg = "Project base dir set to: " + this.baseDir;
-         log(msg, MSG_VERBOSE);
+        log(msg, MSG_VERBOSE);
     }
 
     /**
diff --git a/src/main/org/apache/tools/ant/taskdefs/Ant.java b/src/main/org/apache/tools/ant/taskdefs/Ant.java
index fcbe41066..6b6e65e83 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Ant.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Ant.java
@@ -106,6 +106,15 @@ public class Ant extends Task {
     /** whether the target attribute was specified **/
     private boolean targetAttributeSet = false;
 
+    /**
+     * Whether the basedir of the new project should be the same one
+     * as it would be when running the build file directly -
+     * independent of dir and/or inheritAll settings.
+     *
+     * @since Ant 1.8.0
+     */
+    private boolean allowNativeBasedir = false;
+
     /**
      * simple constructor
      */
@@ -121,6 +130,16 @@ public class Ant extends Task {
         bindToOwner(owner);
     }
 
+    /**
+     * Whether the basedir of the new project should be the same one
+     * as it would be when running the build file directly -
+     * independent of dir and/or inheritAll settings.
+     *
+     * @since Ant 1.8.0
+     */
+    public void setAllowNativeBasedir(boolean b) {
+        allowNativeBasedir = b;
+    }
 
     /**
      * If true, pass all properties to the new Ant project.
@@ -321,12 +340,14 @@ public class Ant extends Task {
             initializeProject();
 
             if (dir != null) {
+                if (!allowNativeBasedir) {
                 newProject.setBaseDir(dir);
                 if (savedDir != null) {
                     // has been set explicitly
                     newProject.setInheritedProperty(MagicNames.PROJECT_BASEDIR,
                                                     dir.getAbsolutePath());
                 }
+                }
             } else {
                 dir = getProject().getBaseDir();
             }
diff --git a/src/main/org/apache/tools/ant/taskdefs/SubAnt.java b/src/main/org/apache/tools/ant/taskdefs/SubAnt.java
index be728ac63..4f7d7ae37 100644
--- a/src/main/org/apache/tools/ant/taskdefs/SubAnt.java
+++ b/src/main/org/apache/tools/ant/taskdefs/SubAnt.java
@@ -553,6 +553,8 @@ public class SubAnt extends Task {
 
         if (directory != null) {
             antTask.setDir(directory);
+        } else {
+            antTask.setAllowNativeBasedir(true);
         }
 
         antTask.setInheritAll(inheritAll);
diff --git a/src/tests/antunit/taskdefs/subant-test.xml b/src/tests/antunit/taskdefs/subant-test.xml
index 673c7d24b..11f7d9f76 100644
--- a/src/tests/antunit/taskdefs/subant-test.xml
+++ b/src/tests/antunit/taskdefs/subant-test.xml
@@ -59,4 +59,10 @@
          target="testSubAntDoesntSetBasedir"/>
   </target>
 
+  <target name="testSubAntDoesntSetBasedirAfterAntWithDirWhenNativeDir">
+    <ant antfile="${ant.file}" dir="${basedir}"
+         target="testSubAntDoesntSetBasedir"
+         allowNativeBaseDir="true"/>
+  </target>
+
 </project>