1 files changed, 5 insertions, 1 deletions
diff --git a/vms/vms.h b/vms/vms.h
index d52b00b4c7..fc57cc8675 100644
--- a/vms/vms.h
+++ b/vms/vms.h
@@ -1,6 +1,10 @@
+#ifndef VMSRUBY_VMS_H_INCLUDED
+#define VMSRUBY_VMS_H_INCLUDED
+
 extern int isinf(double);
 extern int isnan(double);
 extern int flock(int fd, int oper);
 
 extern int vsnprintf();
-extern int snprintf();
+
+#endif