diff --git a/cmake/modules/AddSwift.cmake b/cmake/modules/AddSwift.cmake
index 56fa993418c07..efcdd40655eb3 100644
--- a/cmake/modules/AddSwift.cmake
+++ b/cmake/modules/AddSwift.cmake
@@ -363,7 +363,7 @@ function(_add_variant_c_compile_flags)
     swift_android_libcxx_include_paths(CFLAGS_CXX_INCLUDES)
     swift_android_include_for_arch("${CFLAGS_ARCH}" "${CFLAGS_ARCH}_INCLUDE")
     foreach(path IN LISTS CFLAGS_CXX_INCLUDES ${CFLAGS_ARCH}_INCLUDE)
-      list(APPEND result -isystem;${path})
+      list(APPEND result "SHELL:${CMAKE_INCLUDE_SYSTEM_FLAG_C}${path}")
     endforeach()
     list(APPEND result "-D__ANDROID_API__=${SWIFT_ANDROID_API_LEVEL}")
   elseif(CFLAGS_SDK STREQUAL WINDOWS)