diff --git a/libretroshare/src/gxs/rsgenexchange.cc b/libretroshare/src/gxs/rsgenexchange.cc
index fe25bd64c..c9d49fef0 100644
--- a/libretroshare/src/gxs/rsgenexchange.cc
+++ b/libretroshare/src/gxs/rsgenexchange.cc
@@ -240,7 +240,7 @@ bool RsGenExchange::messagePublicationTest(const RsGxsMsgMetaData& meta)
 {
 	time_t now = time(NULL) ;
 
-    uint32_t store_limit =  (mNetService != NULL)?MESSAGE_STORE_PERIOD:mNetService->getKeepAge(meta.mGroupId,MESSAGE_STORE_PERIOD) ;
+    uint32_t store_limit =  (mNetService == NULL)?MESSAGE_STORE_PERIOD:mNetService->getKeepAge(meta.mGroupId,MESSAGE_STORE_PERIOD) ;
 
 	return meta.mMsgStatus & GXS_SERV::GXS_MSG_STATUS_KEEP || store_limit == 0 || meta.mPublishTs + store_limit >= now ;
 }