diff --git a/compiler/lex.c b/compiler/lex.c
index d967bdb..d4b0950 100644
--- a/compiler/lex.c
+++ b/compiler/lex.c
@@ -190,6 +190,19 @@ read_chr(LexState *ls)
 	return Some(MaybeChr, *ls->fwd++);
 }
 
+static MaybeChr
+skip_line_comment(LexState *ls)
+{
+	MaybeChr c;
+	do {
+		c = read_chr(ls);
+		if (!c.ok)
+			break;
+		++ls->lbegin;
+	} while (c.val != '\n');
+	return c;
+}
+
 static MaybeChr
 skip_whitespace(LexState *ls)
 {
@@ -203,7 +216,9 @@ skip_whitespace(LexState *ls)
 	for (;;) {
 		c = read_chr(ls);
 		if (!c.ok)
-			return None(MaybeChr);
+			break;
+		if (c.val == '/' && peek(ls) == '/')
+			c = skip_line_comment(ls);
 		if (!ascii_isspace(c.val))
 			break;
 		++ls->lbegin;