diff --git a/src/fop.rs b/src/fop.rs
index a56a0a6..8ffb447 100644
--- a/src/fop.rs
+++ b/src/fop.rs
@@ -50,7 +50,7 @@ fn main() {
 					eprintln!("{}: {}: Not a character.", argv[0], arg);
 					exit(EX_USAGE);
 				} else { d = arg_char[0]; }
-				index_arg = o.ind as usize;
+				unsafe { index_arg = *o.ind as usize; }
 			},
 			Err(_) => {
 				eprintln!("{}", usage);