diff --git a/yarp/extension.c b/yarp/extension.c
index 759cd90d70..4e801b3b05 100644
--- a/yarp/extension.c
+++ b/yarp/extension.c
@@ -280,7 +280,7 @@ parser_errors(yp_parser_t *parser, rb_encoding *encoding, VALUE source) {
         VALUE location_argv[] = {
             source,
             LONG2FIX(error->start - parser->start),
-            LONG2FIX(error->end - parser->start)
+            LONG2FIX(error->end - error->start)
         };
 
         VALUE error_argv[] = {
@@ -304,7 +304,7 @@ parser_warnings(yp_parser_t *parser, rb_encoding *encoding, VALUE source) {
         VALUE location_argv[] = {
             source,
             LONG2FIX(warning->start - parser->start),
-            LONG2FIX(warning->end - parser->start)
+            LONG2FIX(warning->end - warning->start)
         };
 
         VALUE warning_argv[] = {