diff --git a/armsrc/optimized_cipher.c b/armsrc/optimized_cipher.c
index faf739beb..fee3c156f 100644
--- a/armsrc/optimized_cipher.c
+++ b/armsrc/optimized_cipher.c
@@ -112,7 +112,7 @@ void opt_successor(const uint8_t *k, State *s, bool y, State *successor) {
 void opt_suc(const uint8_t *k, State *s, uint8_t *in, uint8_t length, bool add32Zeroes) {
     State x2;
     int i;
-    uint8_t head = 0;
+    uint8_t head;
     for (i = 0; i < length; i++) {
         head = 1 & (in[i] >> 7);
         opt_successor(k, s, head, &x2);
@@ -149,8 +149,7 @@ void opt_suc(const uint8_t *k, State *s, uint8_t *in, uint8_t length, bool add32
 }
 
 void opt_output(const uint8_t *k, State *s,  uint8_t *buffer) {
-    uint8_t times = 0;
-    uint8_t bout = 0;
+    uint8_t bout, times = 0;
     State temp = {0, 0, 0, 0};
     for (; times < 4; times++) {
         bout = 0;