diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index 03fe18c2ea4be..5317469a06018 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -64,7 +64,7 @@ s! {
     }
 
     pub struct fd_set {
-        fds_bits: [i32; FD_SETSIZE / 32],
+        pub fds_bits: [i32; FD_SETSIZE / 32],
     }
 }
 
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index ed84bef24780c..981d1c8227b29 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -70,7 +70,7 @@ s! {
     }
 
     pub struct fd_set {
-        fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
+        pub fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
     }
 }