diff --git a/lib/vtls/vtls.c b/lib/vtls/vtls.c
index b36c261393..c38d37a3b0 100644
--- a/lib/vtls/vtls.c
+++ b/lib/vtls/vtls.c
@@ -149,6 +149,7 @@ static const struct alpn_spec ALPN_SPEC_H2_H11 = {
 };
 #endif
 
+#if !defined(CURL_DISABLE_HTTP) || !defined(CURL_DISABLE_PROXY)
 static const struct alpn_spec *
 alpn_get_spec(http_majors allowed, bool use_alpn)
 {
@@ -167,6 +168,7 @@ alpn_get_spec(http_majors allowed, bool use_alpn)
      Avoid "http/1.0" because some servers do not support it. */
   return &ALPN_SPEC_H11;
 }
+#endif /* !CURL_DISABLE_HTTP || !CURL_DISABLE_PROXY */
 #endif /* USE_SSL */