diff --git a/packages/fclones/rlimit.rs.patch b/packages/fclones/rlimit.rs.patch
new file mode 100644
index 0000000000..c07f7a3744
--- /dev/null
+++ b/packages/fclones/rlimit.rs.patch
@@ -0,0 +1,13 @@
+diff --git a/src/rlimit.rs b/src/rlimit.rs
+index f30d8dc..b844aa9 100644
+--- a/src/rlimit.rs
++++ b/src/rlimit.rs
+@@ -8,7 +8,7 @@ use std::sync::Arc;
+ #[cfg(unix)]
+ // Get the maximum number of open file descriptors for this process, and if
+ // the hard limit is larger than the soft limit increase it.
+-fn rlimit_nofile() -> u64 {
++fn rlimit_nofile() -> libc::rlim_t {
+     let mut file_limit = libc::rlimit {
+         rlim_cur: 0,
+         rlim_max: 0,