diff --git a/src/libsodium/sodium/utils.c b/src/libsodium/sodium/utils.c
index fd629e13..334b0c00 100644
--- a/src/libsodium/sodium/utils.c
+++ b/src/libsodium/sodium/utils.c
@@ -158,18 +158,23 @@ int
 sodium_is_zero(const unsigned char *n, const size_t nlen)
 {
     size_t        i = 0U;
+
 #if !defined(CPU_UNALIGNED_ACCESS) || !defined(NATIVE_LITTLE_ENDIAN)
-    uint_fast8_t  c = 0U;
-#else
-    uint_fast64_t c = 0U;
-    for (; i < (nlen & ~0x7); i += 8U) {
-        c |= *((const uint64_t *) (const void *) &n[i]);
-    }
-#endif
+    uint_fast8_t c = 0U;
     for (; i < nlen; i++) {
         c |= n[i];
     }
-    return (int) (((c - 1U) >> 8) & 1U);
+    return (int) ((((uint_fast16_t) c - 1U) >> 8) & 1U);
+#else
+    uint_fast32_t c = 0U;
+    for (; i < (nlen & ~0x3); i += 4U) {
+        c |= *((const uint32_t *) (const void *) &n[i]);
+    }
+    for (; i < nlen; i++) {
+        c |= n[i];
+    }
+    return (int) ((((uint_fast64_t) c - 1U) >> 32) & 1U);
+#endif
 }
 
 void