diff --git a/lib/icinga/compatutility.cpp b/lib/icinga/compatutility.cpp
index 3caf923e6..b837af923 100644
--- a/lib/icinga/compatutility.cpp
+++ b/lib/icinga/compatutility.cpp
@@ -906,5 +906,7 @@ int CompatUtility::MapExternalCommandType(const String& name)
 		return 176;
 	if (name == "CUSTOM_COMMAND")
 		return 999;
+
+	return 0;
 }