diff --git a/Makefile.in b/Makefile.in
index df9cb78ef8f..fc3912cb396 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -346,12 +346,14 @@ STAGE$(1)_T_$(2)_H_$(3) := 						\
 	$$(Q)$$(call CFG_RUN_TARG,$(1),				\
 		$$(CFG_VALGRIND_COMPILE$(1)) 			\
 		$$(HBIN$(1)_H_$(3))/rustc$$(X)			\
+		--cfg stage$(1)					\
 		$$(CFG_RUSTC_FLAGS) --target=$(2))
 
 PERF_STAGE$(1)_T_$(2)_H_$(3) := 				\
 	$$(Q)$$(call CFG_RUN_TARG,$(1),				\
 		$$(CFG_PERF_TOOL) 						\
 		$$(HBIN$(1)_H_$(3))/rustc$$(X)			\
+		--cfg stage$(1)					\
 		$$(CFG_RUSTC_FLAGS) --target=$(2))
 
 endef