diff --git a/ccan/ccan/str/hex/hex.c b/ccan/ccan/str/hex/hex.c
index e2acb27b7..6e031779f 100644
--- a/ccan/ccan/str/hex/hex.c
+++ b/ccan/ccan/str/hex/hex.c
@@ -64,21 +64,3 @@ bool hex_encode(const void *buf, size_t bufsize, char *dest, size_t destsize)
 
 	return true;
 }
-
-bool hex_encode_reversed(const void *buf, size_t bufsize, char *dest, size_t destsize)
-{
-	size_t i;
-
-	if (destsize < hex_str_size(bufsize))
-		return false;
-
-    // Start at end of data, go to index 0.
-	for (i = bufsize; i--;) {
-        unsigned int c = ((const unsigned char *)buf)[i];
-        *(dest++) = hexchar(c >> 4);
-        *(dest++) = hexchar(c & 0xF);
-	}
-	*dest = '\0';
-
-	return true;
-}
diff --git a/ccan/ccan/str/hex/hex.h b/ccan/ccan/str/hex/hex.h
index 8fb6ab523..624a77b10 100644
--- a/ccan/ccan/str/hex/hex.h
+++ b/ccan/ccan/str/hex/hex.h
@@ -41,24 +41,6 @@ bool hex_decode(const char *str, size_t slen, void *buf, size_t bufsize);
  */
 bool hex_encode(const void *buf, size_t bufsize, char *dest, size_t destsize);
 
-/**
- * hex_encode_reversed - Create a nul-terminated reversed hex string
- * @buf: the buffer to read the data from
- * @bufsize: the length of @buf
- * @dest: the string to fill
- * @destsize: the max size of the string
- *
- * Returns true if the string, including terminator, fit in @destsize;
- *
- * Example:
- *	unsigned char buf[] = { 0x1F, 0x2F };
- *	char str[5];
- *
- *	if (!hex_encode(buf, sizeof(buf), str, sizeof(str)))
- *		abort();
- */
-bool hex_encode_reversed(const void *buf, size_t bufsize, char *dest, size_t destsize);
-
 /**
  * hex_str_size - Calculate how big a nul-terminated hex string is
  * @bytes: bytes of data to represent
diff --git a/common/json.c b/common/json.c
index f81f2a027..899f65fdc 100644
--- a/common/json.c
+++ b/common/json.c
@@ -471,15 +471,6 @@ void json_add_hex(struct json_result *result, const char *fieldname,
 	json_add_string(result, fieldname, hex);
 }
 
-void json_add_hex_reversed(struct json_result *result, const char *fieldname,
-		  const void *data, size_t len)
-{
-	char hex[hex_str_size(len)];
-
-	hex_encode_reversed(data, len, hex, sizeof(hex));
-	json_add_string(result, fieldname, hex);
-}
-
 void json_add_object(struct json_result *result, ...)
 {
 	va_list ap;
diff --git a/common/json.h b/common/json.h
index 7deaa6693..b0501b6d0 100644
--- a/common/json.h
+++ b/common/json.h
@@ -102,9 +102,6 @@ void json_add_null(struct json_result *result, const char *fieldname);
 /* '"fieldname" : "0189abcdef..."' or "0189abcdef..." if fieldname is NULL */
 void json_add_hex(struct json_result *result, const char *fieldname,
 		  const void *data, size_t len);
-/* '"fieldname" : "0189abcdef..."' or "0189abcdef..." if fieldname is NULL */
-void json_add_hex_reversed(struct json_result *result, const char *fieldname,
-		  const void *data, size_t len);
 void json_add_object(struct json_result *result, ...);
 
 const char *json_result_string(const struct json_result *result);