diff --git a/artiq-fast/conda/llvm-or1k.nix b/artiq-fast/conda/llvm-or1k.nix
index 80db2d2..4c54973 100644
--- a/artiq-fast/conda/llvm-or1k.nix
+++ b/artiq-fast/conda/llvm-or1k.nix
@@ -32,7 +32,7 @@ let
       -DCMAKE_INSTALL_PREFIX=\$PREFIX \
       -DLLVM_BUILD_LLVM_DYLIB=ON \
       -DLLVM_LINK_LLVM_DYLIB=ON \
-      -DLLVM_TARGETS_TO_BUILD=X86 \
+      -DLLVM_TARGETS_TO_BUILD=X86\;ARM \
       -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=OR1K \
       -DLLVM_ENABLE_ASSERTIONS=OFF \
       -DLLVM_INSTALL_UTILS=ON \