diff --git a/Modules/CMakePlatformId.h.in b/Modules/CMakePlatformId.h.in
index 64a00b3..40668a3 100644
--- a/Modules/CMakePlatformId.h.in
+++ b/Modules/CMakePlatformId.h.in
@@ -87,6 +87,9 @@
 # elif defined(__WINDOWS__)
 #  define PLATFORM_ID "Windows3x"
 
+# elif defined(__VXWORKS__)
+#  define PLATFORM_ID "VxWorks"
+
 # else /* unknown platform */
 #  define PLATFORM_ID
 # endif