diff --git a/src/libipc/sync/semaphore.cpp b/src/libipc/sync/semaphore.cpp
index 8f1dbb7..bf09f04 100644
--- a/src/libipc/sync/semaphore.cpp
+++ b/src/libipc/sync/semaphore.cpp
@@ -7,8 +7,7 @@
 #include "libipc/platform/detail.h"
 #if defined(LIBIPC_OS_WIN)
 #include "libipc/platform/win/semaphore.h"
-#elif defined(LIBIPC_OS_QNX) || defined(LIBIPC_OS_FREEBSD)
-#elif defined(LIBIPC_OS_LINUX) || defined(LIBIPC_OS_QNX)
+#elif defined(LIBIPC_OS_LINUX) || defined(LIBIPC_OS_QNX) || defined(LIBIPC_OS_FREEBSD)
 #include "libipc/platform/posix/semaphore_impl.h"
 #else/*IPC_OS*/
 #   error "Unsupported platform."