diff --git a/src/rpn.rs b/src/rpn.rs
index e369c23..697a4a9 100644
--- a/src/rpn.rs
+++ b/src/rpn.rs
@@ -137,7 +137,7 @@ fn eval(
 
 	// Split the input into tokens.
 	let mut toks: VecDeque<CalcType> = input
-		.split(' ')
+		.split_whitespace()
 		.rev()
 		.map(|t| CalcType::from(t))
 		.collect();
@@ -223,7 +223,6 @@ fn main() -> ExitCode {
 		let input = argv
 			.iter()
 			.skip(1)
-			.rev()
 			.map(|x| x.to_owned())
 			.collect::<Vec<String>>()
 			.join(" ");