diff --git a/cpukit/posix/include/rtems/posix/onceimpl.h b/cpukit/posix/include/rtems/posix/onceimpl.h
index f0238107a6..48f876a7d9 100644
--- a/cpukit/posix/include/rtems/posix/onceimpl.h
+++ b/cpukit/posix/include/rtems/posix/onceimpl.h
@@ -23,7 +23,7 @@
 #include <rtems/score/percpu.h>
 
 #ifndef _RTEMS_POSIX_ONCEIMPL_H
-#define _RTEMS_POSIX_ONCEMPL_H
+#define _RTEMS_POSIX_ONCEIMPL_H
 
 #ifdef __cplusplus
 extern "C" {