diff --git a/proofreading/draft-irtf-cfrg-aegis-aead.html b/proofreading/draft-irtf-cfrg-aegis-aead.html
index dcf2f6f..a79f6fd 100644
--- a/proofreading/draft-irtf-cfrg-aegis-aead.html
+++ b/proofreading/draft-irtf-cfrg-aegis-aead.html
@@ -3321,7 +3321,7 @@ <h2 id="name-aegis-as-a-stream-cipher">
 <p id="section-7-8">Steps:<a href="#section-7-8" class="pilcrow">¶</a></p>
 <div class="alignLeft art-text artwork" id="section-7-9">
 <pre>
-if len = 0:
+if len == 0:
     return {}
 else:
     stream, tag = Encrypt(ZeroPad({ 0 }, len), {}, key, nonce)
diff --git a/proofreading/draft-irtf-cfrg-aegis-aead.txt b/proofreading/draft-irtf-cfrg-aegis-aead.txt
index 1317990..51e6894 100644
--- a/proofreading/draft-irtf-cfrg-aegis-aead.txt
+++ b/proofreading/draft-irtf-cfrg-aegis-aead.txt
@@ -1615,7 +1615,7 @@ return tag
 
    Steps:
 
-   if len = 0:
+   if len == 0:
        return {}
    else:
        stream, tag = Encrypt(ZeroPad({ 0 }, len), {}, key, nonce)