diff --git a/utils/checkpackagelib/lib_mk.py b/utils/checkpackagelib/lib_mk.py
index dd04ffd58f..b805cd9925 100644
--- a/utils/checkpackagelib/lib_mk.py
+++ b/utils/checkpackagelib/lib_mk.py
@@ -126,7 +126,9 @@ class OverriddenVariable(_CheckFunction):
                 self.conditionally_set.append(variable)
                 return
             if self.CONCATENATING.search(text):
-                return
+                return ["{}:{}: immediate assignment to append to variable {}"
+                        .format(self.filename, lineno, variable),
+                        text]
             if self.USUALLY_OVERRIDDEN.search(text):
                 return
             if assignment in self.OVERRIDING_ASSIGNMENTS: