diff --git a/Makefile b/Makefile
index 20340bf..1739015 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ yebisu: GRAPELIB  = -L$(GRAPEHOME) -lyebisug6
 GRAPEINC      = -I$(GRAPEHOME)
 
 CXXFLAGS     ?= -mcmodel=medium
-CFFFLAGS     += -O$(OPTIMIZATION)
+CXXFLAGS     += -O$(OPTIMIZATION)
 INC           = $(GRAPEINC) $(CUDAINC)
 LIB           = $(GRAPELIB) $(CUDALIB) -lm
 MPICXX       ?= mpic++