diff --git a/pkgs/development/compilers/llvm/7/compiler-rt.nix b/pkgs/development/compilers/llvm/7/compiler-rt.nix
index ca3bbf905de1..5d7266f39ecd 100644
--- a/pkgs/development/compilers/llvm/7/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/7/compiler-rt.nix
@@ -7,10 +7,11 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake python llvm ];
   buildInputs = stdenv.lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
-  cmakeFlags = stdenv.lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+  cmakeFlags = stdenv.lib.optionals (stdenv.hostPlatform.useLLVM or false || stdenv.isDarwin) [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
+  ] ++ stdenv.lib.optionals (stdenv.hostPlatform.useLLVM or false) [
     "-DCMAKE_C_FLAGS=-nodefaultlibs"
     "-DCMAKE_CXX_COMPILER_WORKS=ON"
     "-DCOMPILER_RT_BUILD_BUILTINS=ON"