diff --git a/compiler-rt/lib/fuzzer/CMakeLists.txt b/compiler-rt/lib/fuzzer/CMakeLists.txt
--- a/compiler-rt/lib/fuzzer/CMakeLists.txt
+++ b/compiler-rt/lib/fuzzer/CMakeLists.txt
@@ -141,7 +141,7 @@
     get_target_flags_for_arch(${arch} target_cflags)
     if(CMAKE_CXX_COMPILER_ID MATCHES Clang)
       get_compiler_rt_target(${arch} target)
-      set(target_cflags "--target=${target} ${target_cflags}")
+      list(APPEND target_cflags --target=${target})
     endif()
     set(cxx_${arch}_merge_dir "${CMAKE_CURRENT_BINARY_DIR}/cxx_${arch}_merge.dir")
     file(MAKE_DIRECTORY ${cxx_${arch}_merge_dir})