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-rw-r--r--src/libstd/sys/unix/net.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sys/unix/net.rs b/src/libstd/sys/unix/net.rs
index 3f77abd7f44..f124ea651ec 100644
--- a/src/libstd/sys/unix/net.rs
+++ b/src/libstd/sys/unix/net.rs
@@ -213,7 +213,7 @@ impl Socket {
     }
 
     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
-        let mut nonblocking = nonblocking as libc::c_ulong;
+        let mut nonblocking = nonblocking as libc::c_int;
         cvt(unsafe { libc::ioctl(*self.as_inner(), libc::FIONBIO, &mut nonblocking) }).map(|_| ())
     }