diff --git a/glib/src/functions.rs b/glib/src/functions.rs
index 69bec08e56eb..a483f0db34be 100644
--- a/glib/src/functions.rs
+++ b/glib/src/functions.rs
@@ -223,7 +223,7 @@ pub fn charset() -> (bool, Option<&'static GStr>) {
 
 #[cfg(unix)]
 #[doc(alias = "g_unix_open_pipe")]
-pub fn unix_open_pipe(flags: i32) -> Result<(RawFd, RawFd), Error> {
+pub unsafe fn unix_open_pipe(flags: i32) -> Result<(RawFd, RawFd), Error> {
     unsafe {
         let mut fds = [0, 2];
         let mut error = ptr::null_mut();