diff --git a/Cargo.toml b/Cargo.toml
index 73a44f62ce..49c86ee64b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,9 @@ libc = { version = "0.2", optional = true }
 # in Rust code it is imported as `syscall`, NOT `redox_syscall`.
 # This dep is optional and gated by the `redox_syscall` feature
 # above. Matching upstream `libredox 0.1.18` structure.
-redox_syscall = { path = "../syscall", version = "0.9.0+rb0.2.5", optional = true }
+redox_syscall = { path = "../syscall", optional = true }
 ioslice = { version = "0.6", optional = true }
 plain = { version = "0.2", optional = true }
+
+[patch.crates-io]
+redox_syscall = { path = "../syscall" }
diff --git a/src/lib.rs b/src/lib.rs
index 8633d21235..0d7f255b0d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1090,12 +1090,12 @@ pub mod protocol {
     pub const SIGALRM: usize = 14;
     pub const SIGTERM: usize = 15;
     pub const SIGSTKFLT: usize = 16;
-    pub const SIGCHLD: usize = syscall::SIGCHLD;
+    pub const SIGCHLD: usize = 17;
     pub const SIGCONT: usize = 18;
     pub const SIGSTOP: usize = 19;
-    pub const SIGTSTP: usize = syscall::SIGTSTP;
-    pub const SIGTTIN: usize = syscall::SIGTTIN;
-    pub const SIGTTOU: usize = syscall::SIGTTOU;
+    pub const SIGTSTP: usize = 20;
+    pub const SIGTTIN: usize = 21;
+    pub const SIGTTOU: usize = 22;
     pub const SIGURG: usize = 23;
     pub const SIGXCPU: usize = 24;
     pub const SIGXFSZ: usize = 25;
@@ -1137,4 +1137,7 @@ pub mod protocol {
             })
         }
     }
+
+    pub const O_CLOEXEC: usize = 0x0100_0000;
+    pub const F_DUPFD_CLOEXEC: usize = 5;
 }