diff --git a/doc/19-technical-concepts.md b/doc/19-technical-concepts.md
index 21de4eef9..5e9555f3f 100644
--- a/doc/19-technical-concepts.md
+++ b/doc/19-technical-concepts.md
@@ -880,7 +880,7 @@ This section describes the internal cluster messages exchanged between endpoints
 
 > **Tip**
 >
-> Debug builds with `icinga2 daemon -DDebugJsonRpc=1` unveils the JSON-RPC messages.
+> Debug builds with `icinga2 daemon -DInternal.DebugJsonRpc=1` unveils the JSON-RPC messages.
 
 ### Registered Handler Functions