diff --git a/doc/building.html b/doc/building.html
index 96d2916de41..8a0acada254 100644
--- a/doc/building.html
+++ b/doc/building.html
@@ -526,7 +526,7 @@ header files as provided by your distribution.</p>
 <p>The basic tooling is provided as part of the core operating system,
 but you will most likely need to install developer packages.</p>
 <p>For apt-based distributions (Debian, Ubuntu, etc), try this:</p>
-<pre><code>sudo apt-get install build-essential</code></pre>
+<pre><code>sudo apt-get install build-essential autoconf</code></pre>
 <p>For rpm-based distributions (Fedora, Red Hat, etc), try this:</p>
 <pre><code>sudo yum groupinstall &quot;Development Tools&quot;</code></pre>
 <p>For Alpine Linux, aside from basic tooling, install the GNU versions
diff --git a/doc/building.md b/doc/building.md
index 61daed2270b..ed8a0669355 100644
--- a/doc/building.md
+++ b/doc/building.md
@@ -349,7 +349,7 @@ will most likely need to install developer packages.
 For apt-based distributions (Debian, Ubuntu, etc), try this:
 
 ```
-sudo apt-get install build-essential
+sudo apt-get install build-essential autoconf
 ```
 
 For rpm-based distributions (Fedora, Red Hat, etc), try this: