diff --git a/.travis.yml b/.travis.yml
index 68f2201..3c82016 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,9 +25,11 @@ stages:
 jobs:
   include:
     - stage: validations
-      name: "Code validations (format, binary compatibilty, whitesource, etc.)"
+      name: "Code validations (checkstyle)"
       script: ./mvnw -B clean install -DskipTests=true -Pcheckstyle
-    - script: ./mvnw -B clean install -DskipTests=true -Pchecker
+    - stage: validations
+      name: "Checker framework (Nullness checker)."
+      script: ./mvnw -B clean install -DskipTests=true -Pchecker
 
 cache:
   directories:
diff --git a/pom.xml b/pom.xml
index 994c41f..7c0a16b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -288,9 +288,7 @@
                   interpreted from each module directory -->
                 <arg>-Astubs=${checker.stubs.dir}</arg>
                 <arg>
-                  -AskipDefs=^de\.bmarwell\.zchunk\..*\.ReflectionUtil$|io\.github\.zchunk\..*\.ReflectionUtil$
-                  |^de\.bmarwell\.zchunk\..*\.ChecksumUtil$|^io\.github\.zchunk\..*\.ChecksumUtil$
-                  |^.*Test$
+                  -AskipDefs=^io\.github\.zchunk\..*\.ReflectionUtil$|^io\.github\.zchunk\..*\.ChecksumUtil$|^.*Test$
                 </arg>
               </compilerArgs>
             </configuration>