diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e320bc824..f6431836c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [0.30.1] - 2025-05-04
 
+
+### Added
+
+- Add `TryFrom` trait implementation between `i32`/`u32` and `Resource`
+  ([#2645](https://github.com/nix-rust/nix/pull/2645))
+
 ### Fixed
 
 - doc.rs build
diff --git a/src/sys/resource.rs b/src/sys/resource.rs
index 449698dbe2..d0dc449f8b 100644
--- a/src/sys/resource.rs
+++ b/src/sys/resource.rs
@@ -26,6 +26,25 @@ cfg_if! {
     }
 }
 
+cfg_if! {
+    if #[cfg(any(
+            all(
+                target_os = "linux", any(target_env = "gnu", target_env = "uclibc")
+            ),
+            target_os = "hurd"
+    ))] {
+        type resource_repr_t = u32;
+    } else if #[cfg(any(
+        bsd,
+        target_os = "android",
+        target_os = "aix",
+        all(target_os = "linux", not(any(target_env = "gnu", target_env = "uclibc"))),
+        target_os = "cygwin"
+    ))] {
+        type resource_repr_t = i32;
+    }
+}
+
 libc_enum! {
     /// Types of process resources.
     ///
@@ -149,6 +168,7 @@ libc_enum! {
         /// An alias for RLIMIT_AS.
         RLIMIT_VMEM,
     }
+    impl TryFrom<resource_repr_t>
 }
 
 /// Get the current processes resource limits