diff --git a/static/build.html b/static/build.html
index 0813e75c..c44d1c1e 100644
--- a/static/build.html
+++ b/static/build.html
@@ -593,7 +593,7 @@ git am --whitespace=nowarn ../*.patch</pre>
             <p>Generate a signing key for Vanadium if this is the initial build (the sample
             password configured in args.gn is <code>vanadiumpass</code>):</p>
 
-            <pre>keytool -genkey -v -keystore vanadium.keystore -alias vanadiumkey -keyalg RSA -keysize 4096 -sigalg SHA512withRSA -validity 10000 -dname "cn=GrapheneOS"</pre>
+            <pre>keytool -genkey -v -keystore vanadium.keystore -storetype pkcs12 -alias vanadiumkey -keyalg RSA -keysize 4096 -sigalg SHA512withRSA -validity 10000 -dname "cn=GrapheneOS"</pre>
 
             <p>You should back this up with your other keys.</p>