diff --git a/Makefile b/Makefile
index a29314c..8489f6a 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ ifneq ($(KERNEL), Linux)
 $(error only support Linux now.)
 endif
 
-VERSION = $(shell git describe --tags)
+VERSION = $(shell git describe --tags --always)
 
 debug = 0
 
@@ -36,7 +36,7 @@ else
 endif
 
 ifeq ($(shell echo $(VERSION) | head -c 1), v)
-	CFLAGS += -DVERSION=$(VERSION)
+	CFLAGS += -DVERSION=\"$(VERSION)\"
 endif
 
 SRC := $(wildcard *.c)
diff --git a/main.c b/main.c
index 2561e14..120653a 100644
--- a/main.c
+++ b/main.c
@@ -394,7 +394,7 @@ int main(int argc, char **argv)
 		{0, 0, 0, 0}
 	};
 
-	while ((opt = getopt_long(argc, argv, "+ha:p:f:b:w:n", long_opts,
+	while ((opt = getopt_long(argc, argv, "+Vha:p:f:b:w:n", long_opts,
 			    	&index)) != -1) {
 		switch (opt) {
 		case 'a':