diff --git a/libnixf/src/Parse/Lexer.h b/libnixf/src/Parse/Lexer.h
index 7599e13ca..a90a38bbb 100644
--- a/libnixf/src/Parse/Lexer.h
+++ b/libnixf/src/Parse/Lexer.h
@@ -30,7 +30,7 @@ class Lexer {
     assert(Cur.Offset + N <= Src.length());
     // Update Line & Column & Offset
     for (std::size_t I = 0; I < N; ++I) {
-      if (Src[Cur.Offset + N] == '\n') {
+      if (Src[Cur.Offset + I] == '\n') {
         ++Cur.Line;
         Cur.Column = 0;
       } else {
diff --git a/libnixf/test/Parse/Parser.cpp b/libnixf/test/Parse/Parser.cpp
index b0ec735e9..0dd8f4ebd 100644
--- a/libnixf/test/Parse/Parser.cpp
+++ b/libnixf/test/Parse/Parser.cpp
@@ -155,8 +155,8 @@ TEST(Parser, IndentedString) {
   // Check the diagnostic.
   ASSERT_EQ(Diags.size(), 1);
   auto &D = Diags[0];
-  ASSERT_TRUE(D.range().begin().isAt(7, 3, 39));
-  ASSERT_TRUE(D.range().end().isAt(7, 3, 39));
+  ASSERT_TRUE(D.range().begin().isAt(7, 2, 39));
+  ASSERT_TRUE(D.range().end().isAt(7, 2, 39));
   ASSERT_EQ(D.kind(), Diagnostic::DK_Expected);
   ASSERT_EQ(D.args().size(), 1);
   ASSERT_EQ(D.args()[0], "''");
@@ -173,8 +173,8 @@ TEST(Parser, IndentedString) {
   // Check fix-it hints.
   ASSERT_EQ(D.fixes().size(), 1);
   const auto &F = D.fixes()[0];
-  ASSERT_TRUE(F.oldRange().begin().isAt(7, 3, 39));
-  ASSERT_TRUE(F.oldRange().end().isAt(7, 3, 39));
+  ASSERT_TRUE(F.oldRange().begin().isAt(7, 2, 39));
+  ASSERT_TRUE(F.oldRange().end().isAt(7, 2, 39));
   ASSERT_EQ(F.newText(), "''");
 }