diff --git a/src/xrpld/app/misc/NetworkOPs.cpp b/src/xrpld/app/misc/NetworkOPs.cpp
index ebe539523b..b45e1c1e02 100644
--- a/src/xrpld/app/misc/NetworkOPs.cpp
+++ b/src/xrpld/app/misc/NetworkOPs.cpp
@@ -34,6 +34,7 @@
 #include <xrpld/rpc/MPTokenIssuanceID.h>
 #include <xrpld/rpc/ServerHandler.h>
 
+#include <xrpl/basics/MallocTrim.h>
 #include <xrpl/basics/UptimeClock.h>
 #include <xrpl/basics/mulDiv.h>
 #include <xrpl/basics/safe_cast.h>
@@ -2547,10 +2548,14 @@ NetworkOPsImp::setMode(OperatingMode om)
     if (mMode == om)
         return;
 
+    auto const oldMode = mMode;
     mMode = om;
 
     accounting_.mode(om);
 
+    if (oldMode != OperatingMode::FULL && om == OperatingMode::FULL)
+        mallocTrim(std::optional<std::string>("SyncComplete"), m_journal);
+
     JLOG(m_journal.info()) << "STATE->" << strOperatingMode();
     pubServer();
 }