diff --git a/vms/vms.h b/vms/vms.h
index d52b00b4c7..8eaa88cde3 100644
--- a/vms/vms.h
+++ b/vms/vms.h
@@ -1,6 +1,13 @@
+#ifndef __FAST_SETJMP
+#define __FAST_SETJMP	/* use decc$setjmp/decc$longjmp */
+#endif
+
 extern int isinf(double);
 extern int isnan(double);
 extern int flock(int fd, int oper);
 
 extern int vsnprintf();
 extern int snprintf();
+
+#define LONG_LONG long long
+#define SIZEOF_LONG_LONG sizeof(long long)