diff --git a/library/Init/Data/ByteArray/Basic.lean b/library/Init/Data/ByteArray/Basic.lean
index ed2dd9147c..b99f4f3a28 100644
--- a/library/Init/Data/ByteArray/Basic.lean
+++ b/library/Init/Data/ByteArray/Basic.lean
@@ -16,7 +16,7 @@ attribute [extern "lean_byte_array_mk"] ByteArray.mk
 attribute [extern "lean_byte_array_data"] ByteArray.data
 
 namespace ByteArray
-@[extern c inline "lean_mk_empty_byte_array(#1)"]
+@[extern "lean_mk_empty_byte_array"]
 def mkEmpty (c : @& Nat) : ByteArray :=
 { data := #[] }