diff --git a/cmake/llvm-macos-aarch64.cmake b/cmake/llvm-macos-aarch64.cmake
index 05f11b6a1..df67ad45b 100644
--- a/cmake/llvm-macos-aarch64.cmake
+++ b/cmake/llvm-macos-aarch64.cmake
@@ -18,6 +18,5 @@
 
 string(APPEND CMAKE_C_FLAGS_INIT    " -march=armv8.5-a+simd")
 string(APPEND CMAKE_CXX_FLAGS_INIT  " -march=armv8.5-a+simd")
-string(APPEND )
 
 include(${CMAKE_CURRENT_LIST_DIR}/flags-gcc.cmake)