diff --git a/src/W800_SDK_v1.00.10/platform/inc/utils.h b/src/W800_SDK_v1.00.10/platform/inc/utils.h
index c23c73e..7279f7f 100644
--- a/src/W800_SDK_v1.00.10/platform/inc/utils.h
+++ b/src/W800_SDK_v1.00.10/platform/inc/utils.h
@@ -33,6 +33,7 @@ int string_to_uint(char *buf, u32 *d);
 int string_to_ipaddr(const char *buf, u8 *addr);
 char * strdup(const char *s);
 char * strndup(const char *s, size_t len);
+int strcasecmp(const char *s1, const char *s2);
 
 int sendchar(int ch);
 void dumpBuffer(char *name, char* buffer, int len);