diff --git a/src/main/resources/log4j.properties b/src/main/resources/log4j.properties
index 054616465b84838e04c3fdcfc6de1c3b2facfb0b..2ae2c43a6687a2a1e711e0673f1adb90781563ea 100644
--- a/src/main/resources/log4j.properties
+++ b/src/main/resources/log4j.properties
@@ -8,3 +8,4 @@ log4j.category.de.thm.arsnova=INFO
 log4j.category.org.springframework=INFO
 log4j.category.com.corundumstudio.socketio=INFO
 log4j.category.com.fourspaces.couchdb=WARN
+log4j.category.net.sf.json=WARN