diff --git a/reference/filesystem/functions/popen.xml b/reference/filesystem/functions/popen.xml
index eb51722bd8..0f680b5fe6 100644
--- a/reference/filesystem/functions/popen.xml
+++ b/reference/filesystem/functions/popen.xml
@@ -41,7 +41,7 @@
       <para>
        On Windows, <function>popen</function> defaults to text mode, i.e. any <literal>\n</literal>
        characters written to or read from the pipe will be translated to <literal>\r\n</literal>.
-       If this is not desired, binaray mode can be enforced by setting <parameter>mode</parameter>
+       If this is not desired, binary mode can be enforced by setting <parameter>mode</parameter>
        to <literal>'rb'</literal> and <literal>'wb'</literal>, respectively.
       </para>
      </listitem>