diff --git a/assembly/src/main/assembly/all.xml b/assembly/src/main/assembly/all.xml
index 5b01a9fff..c3027ac40 100644
--- a/assembly/src/main/assembly/all.xml
+++ b/assembly/src/main/assembly/all.xml
@@ -21,7 +21,10 @@
  */
 -->
 
-<assembly>
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
+
   <id>all</id>
   <formats>
     <format>zip</format>
diff --git a/assembly/src/main/assembly/apps.xml b/assembly/src/main/assembly/apps.xml
index 2b1aee746..0e09196e8 100644
--- a/assembly/src/main/assembly/apps.xml
+++ b/assembly/src/main/assembly/apps.xml
@@ -20,7 +20,10 @@
  * under the License.
  */
 -->
-<assembly>
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
+
   <id>apps</id>
   <formats>
     <format>zip</format>
diff --git a/assembly/src/main/assembly/docs.xml b/assembly/src/main/assembly/docs.xml
index 91b8d0a22..f486c7ebd 100644
--- a/assembly/src/main/assembly/docs.xml
+++ b/assembly/src/main/assembly/docs.xml
@@ -21,7 +21,9 @@
  */
 -->
 
-<assembly>
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
 
     <id>docs</id>
     <formats>
diff --git a/assembly/src/main/assembly/lib.xml b/assembly/src/main/assembly/lib.xml
index cae5e22f3..a19e2abb0 100644
--- a/assembly/src/main/assembly/lib.xml
+++ b/assembly/src/main/assembly/lib.xml
@@ -21,7 +21,10 @@
  */
 -->
 
-<assembly>
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
+
   <id>lib</id>
   <formats>
     <format>zip</format>
diff --git a/assembly/src/main/assembly/src.xml b/assembly/src/main/assembly/src.xml
index a8540f0c3..e36840c8f 100644
--- a/assembly/src/main/assembly/src.xml
+++ b/assembly/src/main/assembly/src.xml
@@ -21,7 +21,10 @@
  */
 -->
 
-<assembly>
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.3 http://maven.apache.org/xsd/assembly-1.1.3.xsd">
+
   <id>src</id>
   <formats>
     <format>zip</format>