diff --git a/src/core/model/int64x64-cairo.cc b/src/core/model/int64x64-cairo.cc
index f683a4fea..7be6cee48 100644
--- a/src/core/model/int64x64-cairo.cc
+++ b/src/core/model/int64x64-cairo.cc
@@ -1,3 +1,4 @@
+// NOLINTBEGIN
 /*
  * Copyright (c) 2006 INRIA
  *
@@ -228,3 +229,4 @@ int64x64_t::Invert(const uint64_t v)
 } // namespace ns3
 
 #endif /* INT64X64_CAIRO_H */
+// NOLINTEND
diff --git a/src/core/model/int64x64-cairo.h b/src/core/model/int64x64-cairo.h
index 7378286b8..3d77998d1 100644
--- a/src/core/model/int64x64-cairo.h
+++ b/src/core/model/int64x64-cairo.h
@@ -1,3 +1,4 @@
+// NOLINTBEGIN
 /*
  * Copyright (c) 2010 INRIA
  *
@@ -435,3 +436,4 @@ class int64x64_t
 
 #endif /* defined(INT64X64_USE_CAIRO) && !defined(PYTHON_SCAN) */
 #endif /* INT64X64_CAIRO_H */
+// NOLINTEND