Index: src/main/org/apache/tools/ant/RuntimeConfigurable.java
===================================================================
--- src/main/org/apache/tools/ant/RuntimeConfigurable.java	(Revision 894693)
+++ src/main/org/apache/tools/ant/RuntimeConfigurable.java	(Arbeitskopie)
@@ -388,7 +388,13 @@
                 String value = (String) attributeMap.get(name);
 
                 // reflect these into the target
-                Object attrValue = PropertyHelper.getPropertyHelper(p).parseProperties(value);
+				Object attrValue = null;
+				if (!(target instanceof org.apache.tools.ant.taskdefs.MacroInstance)) {
+					attrValue = PropertyHelper.getPropertyHelper(p).parseProperties(value);
+				} else {
+					// do not expand properties in MacroInstances
+					attrValue = value;
+				}
                 try {
                     ih.setAttribute(p, target, name, attrValue);
                 } catch (UnsupportedAttributeException be) {