diff --git a/its/core-it-suite/pom.xml b/its/core-it-suite/pom.xml
index 374ee178e6..95003949ef 100644
--- a/its/core-it-suite/pom.xml
+++ b/its/core-it-suite/pom.xml
@@ -181,6 +181,21 @@ under the License.
           </plugin>
         </plugins>
       </build>
+      <dependencies>
+        <!-- not really used but will force download in the local repo used -->
+        <dependency>
+          <groupId>org.apache.maven.wagon</groupId>
+          <artifactId>wagon-webdav-jackrabbit</artifactId>
+          <version>2.0</version>
+          <scope>test</scope>
+        </dependency>
+        <dependency>
+          <groupId>org.slf4j</groupId>
+          <artifactId>slf4j-api</artifactId>
+          <version>1.6.1</version>
+          <scope>test</scope>
+        </dependency>
+      </dependencies>
     </profile>
     <profile>
       <id>maven-repo-local</id>
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng2305MultipleProxiesTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng2305MultipleProxiesTest.java
index 6c4a8240e7..77396df27e 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng2305MultipleProxiesTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng2305MultipleProxiesTest.java
@@ -97,8 +97,7 @@ public class MavenITmng2305MultipleProxiesTest
             verifier.setSystemProperty( "javax.net.ssl.trustStore", storePath );
             verifier.setSystemProperty( "javax.net.ssl.trustStorePassword", storePwd );
             // disable concurrent downloading as not all wagons (e.g. wagon-lightweight-http) are thread-safe regarding proxy settings
-            // olamy restore concurrent as wagon-http is now thread safe regarding and add an extension in the it pom
-            verifier.setSystemProperty( "maven.artifact.threads", "3" );
+            verifier.setSystemProperty( "maven.artifact.threads", "1" );
             verifier.executeGoal( "validate" );
             verifier.verifyErrorFreeLog();
             verifier.resetStreams();
diff --git a/its/core-it-suite/src/test/resources/mng-2305/pom.xml b/its/core-it-suite/src/test/resources/mng-2305/pom.xml
index 8ee87768a9..df08b228c8 100644
--- a/its/core-it-suite/src/test/resources/mng-2305/pom.xml
+++ b/its/core-it-suite/src/test/resources/mng-2305/pom.xml
@@ -47,13 +47,6 @@ under the License.
   </dependencies>
 
   <build>
-    <extensions>
-      <extension>
-        <groupId>org.apache.maven.wagon</groupId>
-        <artifactId>wagon-http</artifactId>
-        <version>2.0</version>
-      </extension>
-    </extensions>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.its.plugins</groupId>