diff --git a/README.md b/README.md
index e0e4991..3ed3892 100644
--- a/README.md
+++ b/README.md
@@ -1879,7 +1879,7 @@ Struct
 * **Machine’s native type sizes and byte order are used by default.**
 
 ```python
-from struct import pack, unpack, iter_unpack, calcsize
+from struct import pack, unpack, iter_unpack
 <bytes>  = pack('<format>', <num_1> [, <num_2>, ...])
 <tuple>  = unpack('<format>', <bytes>)
 <tuples> = iter_unpack('<format>', <bytes>)
diff --git a/index.html b/index.html
index 609f53a..49d62e0 100644
--- a/index.html
+++ b/index.html
@@ -1666,7 +1666,7 @@ cursor.execute(<span class="hljs-string">'&lt;query&gt;'</span>, &lt;dict/namedt
 <div><h2 id="struct"><a href="#struct" name="struct">#</a>Struct</h2><ul>
 <li><strong>Module that performs conversions between a sequence of numbers and a C struct, represented as a Python bytes object.</strong></li>
 <li><strong>Machine’s native type sizes and byte order are used by default.</strong></li>
-</ul><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> struct <span class="hljs-keyword">import</span> pack, unpack, iter_unpack, calcsize
+</ul><pre><code class="python language-python hljs"><span class="hljs-keyword">from</span> struct <span class="hljs-keyword">import</span> pack, unpack, iter_unpack
 &lt;bytes&gt;  = pack(<span class="hljs-string">'&lt;format&gt;'</span>, &lt;num_1&gt; [, &lt;num_2&gt;, ...])
 &lt;tuple&gt;  = unpack(<span class="hljs-string">'&lt;format&gt;'</span>, &lt;bytes&gt;)
 &lt;tuples&gt; = iter_unpack(<span class="hljs-string">'&lt;format&gt;'</span>, &lt;bytes&gt;)