diff --git a/jsmn.c b/jsmn.c
index 5012337..f11cd04 100644
--- a/jsmn.c
+++ b/jsmn.c
@@ -104,7 +104,7 @@ int jsmn_parse(const unsigned char *js, jsontok_t *tokens, size_t num_tokens, in
 		switch (obj_state[*p]) {
 			case JSON_ERROR:
 				if (errpos != NULL) {
-					*errpos = p;
+					*errpos = p - js;
 				}
 				return -1;