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-rw-r--r--vms/vms.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/vms/vms.h b/vms/vms.h
index d52b00b..fc57cc8 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