diff --git a/Cargo.toml b/Cargo.toml
index 06302aac6d..38fc390087 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ targets = [
 ]
 
 [dependencies]
-libc = { git = "/~https://github.com/rust-lang/libc", rev = "497ac428bc010b5db9682ecf94cd567b31d53e5c", features = ["extra_traits"] }
+libc = { git = "/~https://github.com/rust-lang/libc", rev = "f37806e499409eab8cfa897280a869bc5e2623a9", features = ["extra_traits"] }
 bitflags = "2.3.1"
 cfg-if = "1.0"
 pin-utils = { version = "0.1.0", optional = true }
diff --git a/changelog/2260.added.md b/changelog/2260.added.md
new file mode 100644
index 0000000000..6ab54f3082
--- /dev/null
+++ b/changelog/2260.added.md
@@ -0,0 +1 @@
+Added `MmapFlags::MAP_FIXED` constant in `sys::mman` for netbsd and openbsd
diff --git a/src/sys/mman.rs b/src/sys/mman.rs
index 3518662756..a64f14f588 100644
--- a/src/sys/mman.rs
+++ b/src/sys/mman.rs
@@ -154,6 +154,10 @@ libc_bitflags! {
         /// Pages will be discarded in the core dumps.
         #[cfg(target_os = "openbsd")]
         MAP_CONCEAL;
+        /// Attempt to place the mapping at exactly the address specified in `addr`.
+        /// it's a default behavior on OpenBSD.
+        #[cfg(netbsdlike)]
+        MAP_TRYFIXED;
     }
 }