diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index e2f976c5193a6..057bdfe7432e3 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -1293,12 +1293,6 @@ s! {
         pub dot3Compliance: u32,
     }
 
-    pub struct if_family_id {
-        pub iffmid_len: u32,
-        pub iffmid_id: u32,
-        pub iffmid_str: [::c_char; 1],
-    }
-
     // kern_control.h
     pub struct ctl_info {
         pub ctl_id: u32,