diff --git a/vxworks-6.9/target/src/os/security/secCrypto/src/secSecretLib.c b/vxworks-6.9/target/src/os/security/secCrypto/src/secSecretLib.c
index 77e40b7d..8985f284 100644
--- a/vxworks-6.9/target/src/os/security/secCrypto/src/secSecretLib.c
+++ b/vxworks-6.9/target/src/os/security/secCrypto/src/secSecretLib.c
@@ -77,8 +77,8 @@ SEE ALSO
 #include <sysLib.h>
 
 /* typedefs */
-#ifndef __SIZE_TYPE
-#define __SIZE_TYPE long unsigned int
+#ifndef __SIZE_TYPE__
+#define __SIZE_TYPE__ long unsigned int
 #endif
 typedef __SIZE_TYPE__ rsize_t;   
 typedef int errno_t;