diff --git a/dlls/rsaenh/mpi.c b/dlls/rsaenh/mpi.c
index e05fa59f8bd..3fbca42a8ca 100644
--- a/dlls/rsaenh/mpi.c
+++ b/dlls/rsaenh/mpi.c
@@ -3378,9 +3378,9 @@ static const struct {
 /* returns # of RM trials required for a given bit size */
 int mp_prime_rabin_miller_trials(int size)
 {
-   int x;
+   unsigned int x;
 
-   for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
+   for (x = 0; x < ARRAY_SIZE(sizes); x++) {
        if (sizes[x].k == size) {
           return sizes[x].t;
        } else if (sizes[x].k > size) {
diff --git a/dlls/rsaenh/rsa.c b/dlls/rsaenh/rsa.c
index 5e9019f53d0..7bcfa750efe 100644
--- a/dlls/rsaenh/rsa.c
+++ b/dlls/rsaenh/rsa.c
@@ -29,6 +29,7 @@
  */
 
 #include "tomcrypt.h"
+#include "windef.h"
 
 static const struct {
     int mpi_code, ltc_code;
@@ -41,9 +42,9 @@ static const struct {
 /* convert a MPI error to a LTC error (Possibly the most powerful function ever!  Oh wait... no) */
 static int mpi_to_ltc_error(int err)
 {
-   int x;
+   unsigned int x;
 
-   for (x = 0; x < (int)(sizeof(mpi_to_ltc_codes)/sizeof(mpi_to_ltc_codes[0])); x++) {
+   for (x = 0; x < ARRAY_SIZE(mpi_to_ltc_codes); x++) {
        if (err == mpi_to_ltc_codes[x].mpi_code) { 
           return mpi_to_ltc_codes[x].ltc_code;
        }