diff --git a/Makefile b/Makefile
index 4839231..79b1bd0 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ SRC2 = $(wildcard *.cpp)
 OBJ = $(SRC:.c=.o) $(SRC2:.cpp=.o)
 DEP = $(SRC:.c=.d) $(SRC2:.cpp=.d)
 
-CFLAGS  = $(DFLAGS) -c -O2 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DVDATE=\"`date +"%y%m%d"`\"
+CFLAGS  = $(DFLAGS) -c -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DVDATE=\"`date +"%y%m%d"`\"
 LFLAGS  = -lc -lstdc++ -lrt
 
 $(PRJ): $(OBJ)