diff --git a/core/lib/aes-128.c b/core/lib/aes-128.c
index 59b16421e..23e4356b7 100644
--- a/core/lib/aes-128.c
+++ b/core/lib/aes-128.c
@@ -71,12 +71,8 @@ static uint8_t round_keys[11][AES_128_KEY_LENGTH];
 static uint8_t
 galois_mul2(uint8_t value)
 {
-  if(value >> 7) {
-    value = value << 1;
-    return value ^ 0x1b;
-  } else {
-    return value << 1;
-  }
+  uint8_t xor_val = (value >> 7) * 0x1b;
+  return ((value << 1) ^ xor_val);
 }
 /*---------------------------------------------------------------------------*/
 static void