diff --git a/docs/manual/CoreTasks/macrodef.html b/docs/manual/CoreTasks/macrodef.html
index efce64230..480527ce6 100644
--- a/docs/manual/CoreTasks/macrodef.html
+++ b/docs/manual/CoreTasks/macrodef.html
@@ -59,7 +59,11 @@
       AT this location").
       The escape sequence @@{x} is used to allow @{x} to be
       placed in the text without substitution of x.
-      This corresponds to the $${x} escape sequence for properties
+      This corresponds to the $${x} escape sequence for properties.
+    </p>
+    <p>
+      The case of the attribute is ignored, so @{myAttribute} is treated the
+      same as @{MyAttribute}.
     </p>
     <h3>Parameters</h3>
     <table border="1" cellpadding="2" cellspacing="0">
diff --git a/src/etc/testcases/taskdefs/macrodef.xml b/src/etc/testcases/taskdefs/macrodef.xml
index 67e4024f3..b9fca2666 100644
--- a/src/etc/testcases/taskdefs/macrodef.xml
+++ b/src/etc/testcases/taskdefs/macrodef.xml
@@ -75,4 +75,15 @@
     <property name="property" value="A property value"/>
     <double prop="property"/>
   </target>
+
+  <target name="ignorecase">
+    <macrodef name="ignore">
+      <attribute name="MyAttribute"/>
+      <sequential>
+        <echo>@{myattribute} is @{MYATTRIBUTE}</echo>
+      </sequential>
+    </macrodef>
+    <ignore myattribute="a"/>
+    <ignore Myattribute="b"/>
+  </target>
 </project>
diff --git a/src/main/org/apache/tools/ant/taskdefs/MacroDef.java b/src/main/org/apache/tools/ant/taskdefs/MacroDef.java
index 0cada1721..e9dee157b 100644
--- a/src/main/org/apache/tools/ant/taskdefs/MacroDef.java
+++ b/src/main/org/apache/tools/ant/taskdefs/MacroDef.java
@@ -57,6 +57,7 @@ package org.apache.tools.ant.taskdefs;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Locale;
 import java.util.HashMap;
 
 import org.apache.tools.ant.AntTypeDefinition;
@@ -293,7 +294,7 @@ public class MacroDef extends AntlibDefinition  {
                 throw new BuildException(
                     "Illegal name [" + name + "] for attribute");
             }
-            this.name = name;
+            this.name = name.toLowerCase(Locale.US);
         }
 
         /**
diff --git a/src/main/org/apache/tools/ant/taskdefs/MacroInstance.java b/src/main/org/apache/tools/ant/taskdefs/MacroInstance.java
index 4fff6dd47..639bb5d13 100644
--- a/src/main/org/apache/tools/ant/taskdefs/MacroInstance.java
+++ b/src/main/org/apache/tools/ant/taskdefs/MacroInstance.java
@@ -57,6 +57,7 @@ package org.apache.tools.ant.taskdefs;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Iterator;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.HashSet;
@@ -200,7 +201,7 @@ public class MacroInstance extends Task implements DynamicConfigurator {
                 case STATE_EXPECT_NAME:
                     if (ch == '}') {
                         state = STATE_NORMAL;
-                        String name = macroName.toString();
+                        String name = macroName.toString().toLowerCase(Locale.US);
                         String value = (String) macroMapping.get(name);
                         if (value == null) {
                             ret.append("@{" + name + "}");
diff --git a/src/testcases/org/apache/tools/ant/taskdefs/MacroDefTest.java b/src/testcases/org/apache/tools/ant/taskdefs/MacroDefTest.java
index 1556134e4..73b4a1c44 100644
--- a/src/testcases/org/apache/tools/ant/taskdefs/MacroDefTest.java
+++ b/src/testcases/org/apache/tools/ant/taskdefs/MacroDefTest.java
@@ -103,5 +103,11 @@ public class MacroDefTest extends BuildFileTest {
             "double",
             "@{prop} is 'property', value of ${property} is 'A property value'");
     }
+
+    public void testIgnoreCase() {
+        expectLog(
+            "ignorecase",
+            "a is ab is b");
+    }
 }