diff --git a/WHATSNEW b/WHATSNEW
index d5c9e14db..4e699ed55 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -397,6 +397,10 @@ Fixed bugs:
    PrintWriter at all.
    Bugzilla Report 43537.
 
+ * filesetmanifest="mergewithoutmain" in <jar> didn't treat inline
+   manifests as expected.
+   Bugzilla Report 29731. 
+
 Other changes:
 --------------
  * The get task now also follows redirects from http to https
diff --git a/src/main/org/apache/tools/ant/taskdefs/Jar.java b/src/main/org/apache/tools/ant/taskdefs/Jar.java
index 20811f454..715eb01b4 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Jar.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Jar.java
@@ -513,7 +513,7 @@ public class Jar extends Zip {
                 finalManifest.merge(originalManifest);
             }
             finalManifest.merge(filesetManifest);
-            finalManifest.merge(configuredManifest);
+            finalManifest.merge(configuredManifest, !mergeManifestsMain);
             finalManifest.merge(manifest, !mergeManifestsMain);
 
             return finalManifest;
diff --git a/src/tests/antunit/taskdefs/jar-test.xml b/src/tests/antunit/taskdefs/jar-test.xml
index 6678ef2f6..d4c738263 100644
--- a/src/tests/antunit/taskdefs/jar-test.xml
+++ b/src/tests/antunit/taskdefs/jar-test.xml
@@ -86,4 +86,38 @@
     <au:assertResourceContains value="META-INF"
                                resource="${output}/META-INF/INDEX.LIST"/>
   </target>
+
+  <target name="testMergeWithouMain"
+          description="https://issues.apache.org/bugzilla/show_bug.cgi?id=29731">
+    <mkdir dir="${input}"/>
+    <mkdir dir="${output}"/>
+    <jar destfile="${input}/first.jar">
+      <manifest>
+        <attribute name="First" value="Main Section"/>
+        <section name="Nested">
+          <attribute name="First" value="Nested Section"/>
+        </section>
+      </manifest>
+    </jar>
+    <jar destfile="${output}/second.jar" filesetmanifest="mergewithoutmain">
+      <manifest>
+        <attribute name="Second" value="Main Section"/>
+        <section name="Nested">
+          <attribute name="Second" value="Nested Section"/>
+        </section>
+      </manifest>
+      <zipgroupfileset dir="${input}" includes="first.jar"/>
+    </jar>
+    <unjar src="${output}/second.jar" dest="${output}"/>
+    <au:assertFileExists file="${output}/META-INF/MANIFEST.MF"/>
+    <au:assertResourceContains value="First: Nested Section"
+                               resource="${output}/META-INF/MANIFEST.MF"/>
+    <au:assertResourceContains value="Second: Nested Section"
+                               resource="${output}/META-INF/MANIFEST.MF"/>
+    <au:assertResourceDoesntContain
+       value="First: Main Section"
+       resource="${output}/META-INF/MANIFEST.MF"/>
+    <au:assertResourceContains value="Second: Main Section"
+                               resource="${output}/META-INF/MANIFEST.MF"/>
+  </target>
 </project>