diff --git a/src/Hooks.cpp b/src/Hooks.cpp
index e9bf7f2a6..7d9d772d7 100644
--- a/src/Hooks.cpp
+++ b/src/Hooks.cpp
@@ -327,7 +327,7 @@ void Hooks::onModify (const Task& before, Task& after)
       std::vector <std::string> outputFeedback;
       separateOutput (output, outputJSON, outputFeedback);
 
-      assertNTasks    (outputJSON, 2);
+      assertNTasks    (outputJSON, 1);
       assertValidJSON (outputJSON);
       assertSameTask  (outputJSON, before);