diff --git a/evm/src/cpu/kernel/tests/ripemd.rs b/evm/src/cpu/kernel/tests/ripemd.rs
index 1dd57022..a976b8cc 100644
--- a/evm/src/cpu/kernel/tests/ripemd.rs
+++ b/evm/src/cpu/kernel/tests/ripemd.rs
@@ -5,26 +5,20 @@ use crate::cpu::kernel::aggregator::combined_kernel;
 use crate::cpu::kernel::interpreter::run_with_kernel;
 
 fn make_input(word: &str) -> Vec<u8> {
-        let mut bytes: Vec<u8> = vec![word.len().try_into().unwrap()];
-        bytes.append(&mut word.as_bytes().to_vec());
-        bytes
+    let mut bytes: Vec<u8> = vec![word.len().try_into().unwrap()];
+    bytes.append(&mut word.as_bytes().to_vec());
+    bytes
 }
 
 #[test]
 fn test_ripemd() -> Result<()> {
-
-    let input: Vec<u8> = make_input("abcdefghijklmnopqrstuvwxyz");
-    let expected = "f71c27109c692c1b56bbdceb5b9d2865b3708dbc";
+    let input: Vec<u8> = make_input("a");
+    let expected = U256::from("0x0bdc9d2d256b3ee9daae347be6f4dc835a467ffe");
 
     let kernel = combined_kernel();
     let label = kernel.global_labels["ripemd_alt"];
     let stack_input: Vec<U256> = input.iter().map(|&x| U256::from(x as u8)).rev().collect();
-    let output: String = run_with_kernel(&kernel, label, stack_input)?
-        .stack()
-        .iter()
-        .map(|&x| format!("{:x}", x))
-        .rev()
-        .collect();
+    let output: U256 = run_with_kernel(&kernel, label, stack_input)?.stack()[0];
     assert_eq!(output, expected);
 
     Ok(())