diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/src/lib.rs b/src/lib.rs
index f76d920..87d47c7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -56,7 +56,7 @@ impl AesCipher {
 
         for i in (nwords..4 * (rounds + 1)).step_by(nwords) {
             exp[i] = exp[i - 1];
-            exp[i] = rotl!(exp[i], 1);
+            exp[i] = exp[i].rotate_left(1);
             exp[i] = Self::sub_sbox(exp[i], &SBOX);
             exp[i] ^= (RCON[i / nwords - 1] as u32) << 24;
             exp[i] ^= exp[i - nwords];