diff --git a/lib/icinga/apiactions.cpp b/lib/icinga/apiactions.cpp
index 4326a8207..6e9fddd4d 100644
--- a/lib/icinga/apiactions.cpp
+++ b/lib/icinga/apiactions.cpp
@@ -557,7 +557,7 @@ Dictionary::Ptr ApiActions::RemoveDowntime(const ConfigObject::Ptr& object,
 			childCount += downtime->GetChildren().size();
 
 			try {
-				Downtime::RemoveDowntime(downtime->GetName(), true, true, false, author);
+				Downtime::RemoveDowntime(downtime->GetName(), true, DowntimeRemovedByUser, author);
 			} catch (const invalid_downtime_removal_error& error) {
 				Log(LogWarning, "ApiActions") << error.what();
 
@@ -578,7 +578,7 @@ Dictionary::Ptr ApiActions::RemoveDowntime(const ConfigObject::Ptr& object,
 
 	try {
 		String downtimeName = downtime->GetName();
-		Downtime::RemoveDowntime(downtimeName, true, true, false, author);
+		Downtime::RemoveDowntime(downtimeName, true, DowntimeRemovedByUser, author);
 
 		return ApiActions::CreateResult(200, "Successfully removed downtime '" + downtimeName +
 			"' and " + std::to_string(childCount) + " child downtimes.");
diff --git a/lib/icinga/downtime.cpp b/lib/icinga/downtime.cpp
index 53de3a534..50c91b3f3 100644
--- a/lib/icinga/downtime.cpp
+++ b/lib/icinga/downtime.cpp
@@ -359,7 +359,7 @@ Downtime::Ptr Downtime::AddDowntime(const Checkable::Ptr& checkable, const Strin
 	return downtime;
 }
 
-void Downtime::RemoveDowntime(const String& id, bool includeChildren, bool cancelled, bool expired,
+void Downtime::RemoveDowntime(const String& id, bool includeChildren, DowntimeRemovalReason removalReason,
 	const String& removedBy, const MessageOrigin::Ptr& origin)
 {
 	Downtime::Ptr downtime = Downtime::GetByName(id);
@@ -369,18 +369,18 @@ void Downtime::RemoveDowntime(const String& id, bool includeChildren, bool cance
 
 	String config_owner = downtime->GetConfigOwner();
 
-	if (!config_owner.IsEmpty() && !expired) {
+	if (!config_owner.IsEmpty() && removalReason != DowntimeExpired) {
 		BOOST_THROW_EXCEPTION(invalid_downtime_removal_error("Cannot remove downtime '" + downtime->GetName() +
 			"'. It is owned by scheduled downtime object '" + config_owner + "'"));
 	}
 
 	if (includeChildren) {
 		for (const Downtime::Ptr& child : downtime->GetChildren()) {
-			Downtime::RemoveDowntime(child->GetName(), true, true);
+			Downtime::RemoveDowntime(child->GetName(), true, removalReason);
 		}
 	}
 
-	if (cancelled) {
+	if (removalReason != DowntimeExpired) {
 		downtime->SetRemovalInfo(removedBy, Utility::GetTime());
 	}
 
@@ -396,13 +396,19 @@ void Downtime::RemoveDowntime(const String& id, bool includeChildren, bool cance
 	}
 
 	String reason;
-
-	if (expired) {
-		reason = "expired at " + Utility::FormatDateTime("%Y-%m-%d %H:%M:%S %z", downtime->GetEndTime());
-	} else if (cancelled) {
-		reason = "cancelled by user";
-	} else {
-		reason = "<unknown>";
+	switch (removalReason) {
+		case DowntimeExpired:
+			reason = "expired at " + Utility::FormatDateTime("%Y-%m-%d %H:%M:%S %z", downtime->GetEndTime());
+			break;
+		case DowntimeRemovedByUser:
+			reason = "cancelled by user";
+			if (!removedBy.IsEmpty()) {
+				reason += " '" + removedBy + "'";
+			}
+			break;
+		case DowntimeRemovedByConfigOwner:
+			reason = "cancelled by '" + config_owner + "' of type 'ScheduledDowntime'";
+			break;
 	}
 
 	Log msg (LogInformation, "Downtime");
@@ -465,7 +471,7 @@ void Downtime::SetupCleanupTimer()
 			auto downtime (Downtime::GetByName(name));
 
 			if (downtime && downtime->IsExpired()) {
-				RemoveDowntime(name, false, false, true);
+				RemoveDowntime(name, false, DowntimeExpired);
 			}
 		});
 	}
@@ -557,7 +563,7 @@ void Downtime::DowntimesOrphanedTimerHandler()
 	for (const Downtime::Ptr& downtime : ConfigType::GetObjectsByType<Downtime>()) {
 		/* Only remove downtimes which are activated after daemon start. */
 		if (downtime->IsActive() && !downtime->HasValidConfigOwner())
-			RemoveDowntime(downtime->GetName(), false, false, true);
+			RemoveDowntime(downtime->GetName(), false, DowntimeRemovedByConfigOwner);
 	}
 }
 
diff --git a/lib/icinga/downtime.hpp b/lib/icinga/downtime.hpp
index fa5ceee47..8be69826f 100644
--- a/lib/icinga/downtime.hpp
+++ b/lib/icinga/downtime.hpp
@@ -18,6 +18,13 @@ enum DowntimeChildOptions
 	DowntimeNonTriggeredChildren
 };
 
+enum DowntimeRemovalReason
+{
+	DowntimeExpired,
+	DowntimeRemovedByUser,
+	DowntimeRemovedByConfigOwner,
+};
+
 /**
  * A downtime.
  *
@@ -52,7 +59,7 @@ public:
 		const String& scheduledBy = String(), const String& parent = String(), const String& id = String(),
 		const MessageOrigin::Ptr& origin = nullptr);
 
-	static void RemoveDowntime(const String& id, bool includeChildren, bool cancelled, bool expired = false,
+	static void RemoveDowntime(const String& id, bool includeChildren, DowntimeRemovalReason removalReason,
 		const String& removedBy = "", const MessageOrigin::Ptr& origin = nullptr);
 
 	void RegisterChild(const Downtime::Ptr& downtime);
diff --git a/lib/icinga/externalcommandprocessor.cpp b/lib/icinga/externalcommandprocessor.cpp
index d3af82eed..0560947aa 100644
--- a/lib/icinga/externalcommandprocessor.cpp
+++ b/lib/icinga/externalcommandprocessor.cpp
@@ -993,7 +993,7 @@ void ExternalCommandProcessor::DelSvcDowntime(double, const std::vector<String>&
 	}
 
 	try {
-		Downtime::RemoveDowntime(rid, false, true);
+		Downtime::RemoveDowntime(rid, false, DowntimeRemovedByUser);
 
 		Log(LogNotice, "ExternalCommandProcessor")
 			<< "Removed downtime ID " << arguments[0];
@@ -1112,7 +1112,7 @@ void ExternalCommandProcessor::DelHostDowntime(double, const std::vector<String>
 	}
 
 	try {
-		Downtime::RemoveDowntime(rid, false, true);
+		Downtime::RemoveDowntime(rid, false, DowntimeRemovedByUser);
 
 		Log(LogNotice, "ExternalCommandProcessor")
 			<< "Removed downtime ID " << arguments[0];
@@ -1147,7 +1147,7 @@ void ExternalCommandProcessor::DelDowntimeByHostName(double, const std::vector<S
 	for (const Downtime::Ptr& downtime : host->GetDowntimes()) {
 		try {
 			String downtimeName = downtime->GetName();
-			Downtime::RemoveDowntime(downtimeName, false, true);
+			Downtime::RemoveDowntime(downtimeName, false, DowntimeRemovedByUser);
 
 			Log(LogNotice, "ExternalCommandProcessor")
 				<< "Removed downtime '" << downtimeName << "'.";
@@ -1169,7 +1169,7 @@ void ExternalCommandProcessor::DelDowntimeByHostName(double, const std::vector<S
 
 			try {
 				String downtimeName = downtime->GetName();
-				Downtime::RemoveDowntime(downtimeName, false, true);
+				Downtime::RemoveDowntime(downtimeName, false, DowntimeRemovedByUser);
 
 				Log(LogNotice, "ExternalCommandProcessor")
 					<< "Removed downtime '" << downtimeName << "'.";
diff --git a/lib/icinga/scheduleddowntime.cpp b/lib/icinga/scheduleddowntime.cpp
index 2ad9fa80d..f9ddc4385 100644
--- a/lib/icinga/scheduleddowntime.cpp
+++ b/lib/icinga/scheduleddowntime.cpp
@@ -323,7 +323,7 @@ void ScheduledDowntime::RemoveObsoleteDowntimes()
 			auto configOwnerHash (downtime->GetConfigOwnerHash());
 
 			if (!configOwnerHash.IsEmpty() && configOwnerHash != downtimeOptionsHash)
-				Downtime::RemoveDowntime(downtime->GetName(), false, true);
+				Downtime::RemoveDowntime(downtime->GetName(), false, DowntimeRemovedByConfigOwner);
 		}
 	}
 }