diff --git a/src/journal.cpp b/src/journal.cpp
index 46f74e9..c348cfb 100644
--- a/src/journal.cpp
+++ b/src/journal.cpp
@@ -22,7 +22,7 @@
 namespace monitoring
 {
 
-void JournalBase::operator()()
+void JournalBase::operator()(Context ctx)
 {
     for (const auto& n : index)
     {