diff --git a/mk/prefix.mk b/mk/prefix.mk
index 8521b4333..d5555c938 100644
--- a/mk/prefix.mk
+++ b/mk/prefix.mk
@@ -399,7 +399,6 @@ else
 ifeq ($(PREFIX_USE_UPSTREAM_RUST_COMPILER),1)
 	cp -r "$(LLVM_TARGET)/stage/usr/". "$@.partial"
 endif
-	cp -r "$(LLVM_TARGET)/stage.dev/usr/". "$@.partial"
 	cp -r "$(LLVM_TARGET)/stage.runtime/usr/". "$@.partial"
 	cp -r "$(CLANG_TARGET)/stage/usr/". "$@.partial"
 	cp -r "$(LLD_TARGET)/stage/usr/". "$@.partial"