diff --git a/src/ca/catime.c b/src/ca/catime.c
index b671e09b7..5e2be439a 100644
--- a/src/ca/catime.c
+++ b/src/ca/catime.c
@@ -40,7 +40,7 @@
 #define NELEMENTS(A) (sizeof (A) / sizeof ((A) [0]))
 #endif
 
-#ifdef vxWorks
+#if defined(vxWorks) || defined(VMS)
 #define ITERATION_COUNT 1000
 #else
 #define ITERATION_COUNT 10000