diff --git a/bn_mp_tc_and.c b/bn_mp_tc_and.c
index e9fe4c6..d1f1b91 100644
--- a/bn_mp_tc_and.c
+++ b/bn_mp_tc_and.c
@@ -16,12 +16,14 @@
 /* two complement and */
 int mp_tc_and(const mp_int *a, const mp_int *b, mp_int *c)
 {
-   int res = MP_OKAY, bits;
+   int res = MP_OKAY, bits, abits, bbits;
    int as = mp_isneg(a), bs = mp_isneg(b);
    mp_int *mx = NULL, _mx, acpy, bcpy;
 
    if ((as != MP_NO) || (bs != MP_NO)) {
-      bits = MAX(mp_count_bits(a), mp_count_bits(b));
+      abits = mp_count_bits(a);
+      bbits = mp_count_bits(b);
+      bits = MAX(abits, bbits);
       res = mp_init_set_int(&_mx, 1uL);
       if (res != MP_OKAY) {
          goto end;
diff --git a/bn_mp_tc_or.c b/bn_mp_tc_or.c
index 91b6b40..f177c39 100644
--- a/bn_mp_tc_or.c
+++ b/bn_mp_tc_or.c
@@ -16,12 +16,14 @@
 /* two complement or */
 int mp_tc_or(const mp_int *a, const mp_int *b, mp_int *c)
 {
-   int res = MP_OKAY, bits;
+   int res = MP_OKAY, bits, abits, bbits;
    int as = mp_isneg(a), bs = mp_isneg(b);
    mp_int *mx = NULL, _mx, acpy, bcpy;
 
    if ((as != MP_NO) || (bs != MP_NO)) {
-      bits = MAX(mp_count_bits(a), mp_count_bits(b));
+      abits = mp_count_bits(a);
+      bbits = mp_count_bits(b);
+      bits = MAX(abits, bbits);
       res = mp_init_set_int(&_mx, 1uL);
       if (res != MP_OKAY) {
          goto end;
diff --git a/bn_mp_tc_xor.c b/bn_mp_tc_xor.c
index 50fb12d..a2c67a2 100644
--- a/bn_mp_tc_xor.c
+++ b/bn_mp_tc_xor.c
@@ -16,12 +16,14 @@
 /* two complement xor */
 int mp_tc_xor(const mp_int *a, const mp_int *b, mp_int *c)
 {
-   int res = MP_OKAY, bits;
+   int res = MP_OKAY, bits, abits, bbits;
    int as = mp_isneg(a), bs = mp_isneg(b);
    mp_int *mx = NULL, _mx, acpy, bcpy;
 
    if ((as != MP_NO) || (bs != MP_NO)) {
-      bits = MAX(mp_count_bits(a), mp_count_bits(b));
+      abits = mp_count_bits(a);
+      bbits = mp_count_bits(b);
+      bits = MAX(abits, bbits);
       res = mp_init_set_int(&_mx, 1uL);
       if (res != MP_OKAY) {
          goto end;