diff --git a/lib/icinga/apiactions.cpp b/lib/icinga/apiactions.cpp
index 86a564eb471..cbfcd32ee0c 100644
--- a/lib/icinga/apiactions.cpp
+++ b/lib/icinga/apiactions.cpp
@@ -200,7 +200,7 @@ Dictionary::Ptr ApiActions::AcknowledgeProblem(const ConfigObject::Ptr& object,
 	if (params->Contains("sticky"))
 		sticky = AcknowledgementSticky;
 	if (params->Contains("notify"))
-		notify = true;
+		notify = HttpUtility::GetLastParameter(params, "notify");
 	if (params->Contains("persistent"))
 		persistent = HttpUtility::GetLastParameter(params, "persistent");
 	if (params->Contains("expiry"))