diff --git a/lib/common/mem.h b/lib/common/mem.h
index ceafd57b..dbefcdb2 100644
--- a/lib/common/mem.h
+++ b/lib/common/mem.h
@@ -63,7 +63,7 @@ extern "C" {
 /*-**************************************************************
 *  Basic Types
 *****************************************************************/
-#if defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+#if !defined (__VMS) && ( defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
 # include <stdint.h>
   typedef  uint8_t BYTE;
   typedef uint16_t U16;