diff --git a/src/hex_to_base64.rs b/src/hex_to_base64.rs
index cf14f51..8a01eb3 100644
--- a/src/hex_to_base64.rs
+++ b/src/hex_to_base64.rs
@@ -1,5 +1,6 @@
 mod hex;
 
+#[cfg(not(test))]
 fn main() {
     println!("Output: {}", hex::hex_to_int('0'));
 }