diff --git a/.travis.yml b/.travis.yml
index cc1e614a23..bb0ad50ba4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -46,10 +46,7 @@ script:
     - ./dist/tools/licenses/check.sh master --diff-filter=MR --error-exitcode=0 || exit
     - ./dist/tools/licenses/check.sh master --diff-filter=AC || exit
 
-# TODO:
-#   Remove the `AC` argument when all headers have been
-#   taken care of in master.
-    - ./dist/tools/externc/check.sh master AC || exit
+    - ./dist/tools/externc/check.sh master || exit
 
 # TODO:
 #   Remove all but `master` parameters to cppcheck (and remove second