diff --git a/Makefile.in b/Makefile.in
index d693d7d5100b..cae6155933c5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -24,6 +24,9 @@ endif
 ifdef TIME_PASSES
   CFG_RUSTC_FLAGS += --time-passes
 endif
+ifdef TIME_LLVM_PASSES
+  CFG_RUSTC_FLAGS += --time-llvm-passes
+endif
 ifdef NO_TYPESTATE
   CFG_RUSTC_FLAGS += --no-typestate
 endif