diff --git a/core/lib/mmem.c b/core/lib/mmem.c
index a6ff1b59c..20c7390fd 100644
--- a/core/lib/mmem.c
+++ b/core/lib/mmem.c
@@ -151,8 +151,13 @@ mmem_free(struct mmem *m)
 void
 mmem_init(void)
 {
+  static int inited = 0;
+  if(inited) {
+    return;
+  }
   list_init(mmemlist);
   avail_memory = MMEM_SIZE;
+  inited = 1;
 }
 /*---------------------------------------------------------------------------*/