diff --git a/util/rcu.c b/util/rcu.c
index ca5a63e..f4d09c8 100644
--- a/util/rcu.c
+++ b/util/rcu.c
@@ -32,6 +32,9 @@
 #include "qemu/atomic.h"
 #include "qemu/thread.h"
 #include "qemu/main-loop.h"
+#if defined(CONFIG_MALLOC_TRIM)
+#include <malloc.h>
+#endif
 
 /*
  * Global grace period counter.  Bit 0 is always one in rcu_gp_ctr.
@@ -246,6 +249,9 @@
                 qemu_event_reset(&rcu_call_ready_event);
                 n = atomic_read(&rcu_call_count);
                 if (n == 0) {
+#if defined(CONFIG_MALLOC_TRIM)
+                    malloc_trim(4 * 1024 * 1024);
+#endif
                     qemu_event_wait(&rcu_call_ready_event);
                 }
             }