diff --git a/vvp/vvp_island.cc b/vvp/vvp_island.cc
index d52db7773..1efc05e1a 100644
--- a/vvp/vvp_island.cc
+++ b/vvp/vvp_island.cc
@@ -25,6 +25,7 @@
 # include  <list>
 # include  <assert.h>
 # include  <stdlib.h>
+# include  <string.h>
 #ifdef HAVE_MALLOC_H
 # include  <malloc.h>
 #endif