diff --git a/vvp/vvp_net.h b/vvp/vvp_net.h
index 9b55a25e4..51180d268 100644
--- a/vvp/vvp_net.h
+++ b/vvp/vvp_net.h
@@ -21,6 +21,7 @@
 
 # include  "config.h"
 # include  <stddef.h>
+# include  <string.h>
 # include  <new>
 # include  <assert.h>