diff --git a/CMake/Platforms.cmake b/CMake/Platforms.cmake
index b41520268..1d696d0ff 100644
--- a/CMake/Platforms.cmake
+++ b/CMake/Platforms.cmake
@@ -9,15 +9,15 @@ if(HAIKU)
   set(UBSAN OFF)
 endif()
 
-if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD|OpenBSD|DragonFly|NetBSD")
-  if(${CMAKE_SYSTEM_NAME} MATCHES "NetBSD")
+if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD|OpenBSD|DragonFly|NetBSD")
+  if(CMAKE_SYSTEM_NAME MATCHES "NetBSD")
     add_definitions(-D_NETBSD_SOURCE)
   else()
     add_definitions(-D_BSD_SOURCE)
     set(UBSAN OFF)
   endif()
   set(ASAN OFF)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DO_LARGEFILE=0 -Dstat64=stat -Dlstat64=lstat -Dlseek64=lseek -Doff64_t=off_t -Dfstat64=fstat -Dftruncate64=ftruncate")
+  add_definitions(-DO_LARGEFILE=0 -Dstat64=stat -Dlstat64=lstat -Dlseek64=lseek -Doff64_t=off_t -Dfstat64=fstat -Dftruncate64=ftruncate)
 endif()
 
 set(TARGET_PLATFORM host CACHE STRING "Target platform")