diff --git a/vpi/vcd_priv2.cc b/vpi/vcd_priv2.cc
index a41c5b5a4..dd74ba723 100644
--- a/vpi/vcd_priv2.cc
+++ b/vpi/vcd_priv2.cc
@@ -23,6 +23,7 @@
 # include  <string>
 # include  <pthread.h>
 # include  <cstdlib>
+# include  <cstdint>
 # include  <cstring>
 # include  <cassert>