diff --git a/pkgs/development/compilers/llvm/12/llvm/default.nix b/pkgs/development/compilers/llvm/12/llvm/default.nix
index 41b7211b2a5..dfc707f034d 100644
--- a/pkgs/development/compilers/llvm/12/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/12/llvm/default.nix
@@ -127,6 +127,7 @@ in stdenv.mkDerivation (rec {
     "-DLLVM_HOST_TRIPLE=${stdenv.hostPlatform.config}"
     "-DLLVM_DEFAULT_TARGET_TRIPLE=${stdenv.hostPlatform.config}"
     "-DLLVM_ENABLE_DUMP=ON"
+    "-DLLVM_TARGETS_TO_BUILD=X86:ARM;RISCV"
   ] ++ optionals enableSharedLibraries [
     "-DLLVM_LINK_LLVM_DYLIB=ON"
   ] ++ optionals enableManpages [