diff --git a/spec/runtime/helpers/spy_reader.cc b/spec/runtime/helpers/spy_reader.cc
index bc71df74..8af2cfd6 100644
--- a/spec/runtime/helpers/spy_reader.cc
+++ b/spec/runtime/helpers/spy_reader.cc
@@ -64,8 +64,7 @@ const char * SpyReader::read(size_t *bytes_read) {
 }
 
 int SpyReader::seek(size_t pos) {
-  if (position != pos)
-    strings_read.push_back("");
+  strings_read.push_back("");
   position = pos;
   return 0;
 }
diff --git a/src/runtime/lexer.c b/src/runtime/lexer.c
index ff6277ef..3d3cbb26 100644
--- a/src/runtime/lexer.c
+++ b/src/runtime/lexer.c
@@ -9,7 +9,8 @@ static const char *empty_chunk = "";
 
 static void ts_lexer_read_next_chunk(TSLexer *lexer) {
   TSInput input = lexer->input;
-  input.seek_fn(input.data, lexer->current_position);
+  if (lexer->current_position.bytes != lexer->chunk_start + lexer->chunk_size)
+    input.seek_fn(input.data, lexer->current_position);
   lexer->chunk_start = lexer->current_position.bytes;
   lexer->chunk = input.read_fn(input.data, &lexer->chunk_size);
   if (!lexer->chunk_size)