diff --git a/lib/internal/http2/core.js b/lib/internal/http2/core.js
index 7a1847f77000b7..4ec3608d499a42 100644
--- a/lib/internal/http2/core.js
+++ b/lib/internal/http2/core.js
@@ -161,6 +161,7 @@ function debugSessionObj(session, message, ...args) {
 const kMaxFrameSize = (2 ** 24) - 1;
 const kMaxInt = (2 ** 32) - 1;
 const kMaxStreams = (2 ** 31) - 1;
+const kMaxALTSVC = (2 ** 14) - 2;
 
 // eslint-disable-next-line no-control-regex
 const kQuotedString = /^[\x09\x20-\x5b\x5d-\x7e\x80-\xff]*$/;
@@ -1476,7 +1477,7 @@ class ServerHttp2Session extends Http2Session {
       throw new ERR_INVALID_CHAR('alt');
 
     // Max length permitted for ALTSVC
-    if ((alt.length + (origin !== undefined ? origin.length : 0)) > 16382)
+    if ((alt.length + (origin !== undefined ? origin.length : 0)) > kMaxALTSVC)
       throw new ERR_HTTP2_ALTSVC_LENGTH();
 
     this[kHandle].altsvc(stream, origin || '', alt);
@@ -1508,7 +1509,7 @@ class ServerHttp2Session extends Http2Session {
       len += origin.length;
     }
 
-    if (len > 16382)
+    if (len > kMaxALTSVC)
       throw new ERR_HTTP2_ORIGIN_LENGTH();
 
     this[kHandle].origin(arr, count);