diff --git a/cpukit/libcsupport/include/sys/ioccom.h b/cpukit/libcsupport/include/sys/ioccom.h
index ed1fe8bc86..1a7fd27ef7 100644
--- a/cpukit/libcsupport/include/sys/ioccom.h
+++ b/cpukit/libcsupport/include/sys/ioccom.h
@@ -86,7 +86,7 @@
 #define FIOSETOWN       _IOW('f', 124, int)     /* set owner */
 #define FIOGETOWN       _IOR('f', 123, int)     /* get owner */
 
-#ifndef KERNEL
+#ifndef _KERNEL
 
 #include <rtems/bsd/sys/cdefs.h>