diff --git a/src/header/netdb/mod.rs b/src/header/netdb/mod.rs
index 1d9941cbc5..d07b23331f 100644
--- a/src/header/netdb/mod.rs
+++ b/src/header/netdb/mod.rs
@@ -1069,10 +1069,22 @@ pub unsafe extern "C" fn freeaddrinfo(res: *mut addrinfo) {
                 unsafe { drop(Box::from_raw(bai.ai_addr.cast::<sockaddr_in>())) };
             } else if bai.ai_addrlen == mem::size_of::<sockaddr_in6>() as socklen_t {
                 unsafe { drop(Box::from_raw(bai.ai_addr.cast::<sockaddr_in6>())) };
+            } else if bai.ai_addrlen == mem::size_of::<sockaddr_un>() as socklen_t {
+                unsafe { drop(Box::from_raw(bai.ai_addr.cast::<sockaddr_un>())) };
+            } else if bai.ai_addrlen == 0 {
+                // No address to free.
             } else {
-                todo_skip!(0, "freeaddrinfo: unknown ai_addrlen {}", bai.ai_addrlen);
+                // Unknown ai_addrlen — free as raw allocation to avoid leak.
+                let layout = alloc::alloc::Layout::from_size_align(
+                    bai.ai_addrlen as usize,
+                    mem::align_of::<libc::sa_family_t>(),
+                ).unwrap_or(alloc::alloc::Layout::new::<u8>());
+                unsafe {
+                    alloc::alloc::dealloc(bai.ai_addr.cast::<u8>(), layout);
+                }
             }
         }
+        }
         ai = bai.ai_next;
     }
 }