diff --git a/regex-capi/Cargo.toml b/regex-capi/Cargo.toml
index b583d83f7..f4265577d 100644
--- a/regex-capi/Cargo.toml
+++ b/regex-capi/Cargo.toml
@@ -12,6 +12,7 @@ A C API for Rust's regular expression library.
 """
 workspace = ".."
 edition = "2021"
+rust-version = "1.65"
 
 [lib]
 name = "rure"
diff --git a/regex-capi/src/macros.rs b/regex-capi/src/macros.rs
index a716206ba..6de0b6827 100644
--- a/regex-capi/src/macros.rs
+++ b/regex-capi/src/macros.rs
@@ -18,7 +18,10 @@ macro_rules! ffi_fn {
                     } else {
                         "UNABLE TO SHOW RESULT OF PANIC.".to_owned()
                     };
-                    let _ = writeln!(&mut io::stderr(), "panic unwind caught, aborting: {msg:?}");
+                    let _ = writeln!(
+                        &mut io::stderr(),
+                        "panic unwind caught, aborting: {msg:?}"
+                    );
                     unsafe { abort() }
                 }
             }