diff --git a/multibyte.h b/multibyte.h
index 4a0fe7e..bae90ad 100644
--- a/multibyte.h
+++ b/multibyte.h
@@ -60,7 +60,7 @@ extern int pg_CS_code(const char *stat_string);
 typedef struct
 {
 	int	ccsc;
-	const char *encstr;
+	const UCHAR *encstr;
 	ssize_t	pos;
 	int	ccst;
 } encoded_str;