diff --git a/library/init/data/nat/bitwise.lean b/library/init/data/nat/bitwise.lean
index 1642aa2299..006dcf100c 100644
--- a/library/init/data/nat/bitwise.lean
+++ b/library/init/data/nat/bitwise.lean
@@ -18,7 +18,9 @@ else
   let r  := bitwise n' m' in
   if f b₁ b₂ then bit1 r else bit0 r
 
+@[extern cpp "lean::nat_land"]
 def land : Nat → Nat → Nat := bitwise and
+@[extern cpp "lean::nat_lor"]
 def lor  : Nat → Nat → Nat := bitwise or
 
 end Nat