diff --git a/os-posix.c b/os-posix.c
index 00133a0c7..6321e990c 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -110,7 +110,7 @@ char *os_find_datadir(const char *argv0)
         size_t len = sizeof(buf) - 1;
 
         *buf = '\0';
-        if (!sysctl(mib, sizeof(mib)/sizeof(*mib), buf, &len, NULL, 0) &&
+        if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
             *buf) {
             buf[sizeof(buf) - 1] = '\0';
             p = buf;
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index dcfd81b7a..dade14580 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -543,7 +543,7 @@ static int check_features_against_host(x86_def_t *guest_def)
             ~CPUID_EXT3_SVM, ext3_feature_name, 0x80000001}};
 
     cpu_x86_fill_host(&host_def);
-    for (rv = 0, i = 0; i < sizeof (ft) / sizeof (ft[0]); ++i)
+    for (rv = 0, i = 0; i < ARRAY_SIZE(ft); ++i)
         for (mask = 1; mask; mask <<= 1)
             if (ft[i].check_feat & mask && *ft[i].guest_feat & mask &&
                 !(*ft[i].host_feat & mask)) {