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-rw-r--r--Makefile.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.in b/Makefile.in
index fa4c327f061..baae56c4f40 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -111,7 +111,7 @@ ifdef SAVE_TEMPS
   CFG_RUSTC_FLAGS += --save-temps
 endif
 ifdef ASM_COMMENTS
-  CFG_RUSTC_FLAGS += -z asm-comments
+  CFG_RUSTC_FLAGS += -Z asm-comments
 endif
 ifdef TIME_PASSES
   CFG_RUSTC_FLAGS += -Z time-passes