diff --git a/src/js_lexer.zig b/src/js_lexer.zig
index 2700fd21335569..c9dd2d56ac5fde 100644
--- a/src/js_lexer.zig
+++ b/src/js_lexer.zig
@@ -807,6 +807,7 @@ fn NewLexer_(
 
         inline fn nextCodepoint(it: *LexerType) CodePoint {
             if (it.current >= it.source.contents.len) {
+                it.end = it.source.contents.len;
                 return -1;
             }
             const cp_len = strings.wtf8ByteSequenceLengthWithInvalid(it.source.contents.ptr[it.current]);