diff --git a/Makefile.rules b/Makefile.rules
index 7245c9198a1..897905f7ae0 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -221,7 +221,7 @@ ifndef LLI
 LLI      := $(LLVMToolDir)/lli$(EXEEXT)
 endif
 ifndef LOPT
-LOPT     := $(LLVMToolDir)/lopt$(EXEEXT)
+LOPT     := $(LLVMToolDir)/opt$(EXEEXT)
 endif
 
 #--------------------------------------------------------------------