diff --git a/mk/stage2.mk b/mk/stage2.mk
index 74e76c3ce03..5e7a7885195 100644
--- a/mk/stage2.mk
+++ b/mk/stage2.mk
@@ -1,5 +1,6 @@
-stage2/std.o: $(STDLIB_CRATE) $(STDLIB_INPUTS) stage1/rustc$(X) \
-              stage1/intrinsics.bc $(MKFILES)
+stage2/std.o: $(STDLIB_CRATE) $(STDLIB_INPUTS) \
+              stage1/rustc$(X) stage1/$(CFG_STDLIB) stage1/intrinsics.bc \
+              $(LREQ) $(MKFILES)
 	@$(call E, compile: $@)
 	$(STAGE1) -c --shared -o $@ $<
 
diff --git a/mk/stage3.mk b/mk/stage3.mk
index 427f37f88ee..feba49727ca 100644
--- a/mk/stage3.mk
+++ b/mk/stage3.mk
@@ -1,5 +1,6 @@
-stage3/std.o: $(STDLIB_CRATE) $(STDLIB_INPUTS) stage2/rustc$(X) \
-              stage2/intrinsics.bc $(MKFILES)
+stage3/std.o: $(STDLIB_CRATE) $(STDLIB_INPUTS) \
+              stage2/rustc$(X) stage2/$(CFG_STDLIB) stage2/intrinsics.bc \
+              $(LREQ) $(MKFILES)
 	@$(call E, compile: $@)
 	$(STAGE2) -c --shared -o $@ $<