diff --git a/ipmitool/include/ipmitool/helper.h b/ipmitool/include/ipmitool/helper.h
index b821912..4991561 100644
--- a/ipmitool/include/ipmitool/helper.h
+++ b/ipmitool/include/ipmitool/helper.h
@@ -38,10 +38,10 @@
 #define IPMI_HELPER_H
 
 struct valstr {
-	unsigned char val;
+	unsigned short val;
 	const char * str;
 };
-const char * val2str(unsigned char val, const struct valstr * vs);
+const char * val2str(unsigned short val, const struct valstr * vs);
 
 unsigned short buf2short(unsigned char * buf);
 unsigned long buf2long(unsigned char * buf);
diff --git a/ipmitool/lib/helper.c b/ipmitool/lib/helper.c
index f68242c..8a89ea4 100644
--- a/ipmitool/lib/helper.c
+++ b/ipmitool/lib/helper.c
@@ -86,7 +86,7 @@ void printbuf(unsigned char * buf, int len, char * desc)
 	printf("\n");
 }
 
-const char * val2str(unsigned char val, const struct valstr *vs)
+const char * val2str(unsigned short val, const struct valstr *vs)
 {
 	static char un_str[16];
 	int i = 0;