diff --git a/src/platforms/px4_posix.h b/src/platforms/px4_posix.h
index 9aa7c0e15a..9674b1c896 100644
--- a/src/platforms/px4_posix.h
+++ b/src/platforms/px4_posix.h
@@ -71,7 +71,7 @@ __END_DECLS
 
 #else
 
-typedef px4_sem_t		sem_t
+typedef sem_t px4_sem_t
 
 #define px4_sem_init		_GLOBAL sem_init
 #define px4_sem_wait		_GLOBAL sem_wait