diff --git a/pom.xml b/pom.xml
index 4e1e5f21b..480d9b64b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1232,6 +1232,9 @@
             <excludedLink>https://www.scm-manager.org/</excludedLink>
             <!-- linkcheck plugin can not resolve &amps; inside url -->
             <excludedLink>https://flattr.com/submit/</excludedLink>
+            <!-- Too unstable sites to keep validate them -->
+            <excludedLink>http://tide.olympe.in/*</excludedLink>
+            <excludedLink>http://dl.acm.org/*</excludedLink>
           </excludedLinks>
         </configuration>
       </plugin>