diff --git a/README.md b/README.md
index eb64b6eb..86950405 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ openssl ecparam -genkey -name prime256v1 -out private_key.pem
 To derive a public key from the just-generated private key, to be used in the JavaScript client:
 
 ```
-openssl ec -in private_key.pem -pubout -outform DER|tail -c 65|base64|tr '/+' '_-'|tr -d '\n'
+openssl ec -in private_key.pem -pubout -outform DER|tail -c 65|base64|tr '/+' '_-'|tr -d '\n='
 ```
 
 The signature is created with `VapidSignatureBuilder`. It automatically adds the required claims `aud` and `exp`. Adding