diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb7cc0b490a..1075ffce986 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@ set(CMAKE_OSX_SYSROOT ${HERMES_APPLE_TARGET_PLATFORM})
 
 if(HERMES_APPLE_TARGET_PLATFORM MATCHES "catalyst")
   set(CMAKE_OSX_SYSROOT "macosx")
-  set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-target x86_64-arm64-apple-ios14.0-macabi -isystem ${CMAKE_OSX_SYSROOT}/System/iOSSupport/usr/include")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -target x86_64-arm64-apple-ios14.0-macabi -isystem ${CMAKE_OSX_SYSROOT}/System/iOSSupport/usr/include")
   set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} "-target x86_64-arm64-apple-ios14.0-macabi -isystem ${CMAKE_OSX_SYSROOT}/System/iOSSupport/usr/include")
   set(CMAKE_THREAD_LIBS_INIT "-lpthread")
   set(CMAKE_HAVE_THREADS_LIBRARY 1)