diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec6d1dc367..20b3bf6a04 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -455,7 +455,7 @@ option(CURL_DISABLE_HTTP "Disable HTTP" OFF)
 mark_as_advanced(CURL_DISABLE_HTTP)
 option(CURL_DISABLE_HTTP_AUTH "Disable all HTTP authentication methods" OFF)
 mark_as_advanced(CURL_DISABLE_HTTP_AUTH)
-option(CURL_DISABLE_HTTPSIG "Disable HTTP Message Signatures (RFC 9421) (experimental)" ON)
+option(CURL_DISABLE_HTTPSIG "Disable HTTP Message Signatures (RFC 9421) (experimental)" OFF)
 mark_as_advanced(CURL_DISABLE_HTTPSIG)
 option(CURL_DISABLE_IMAP "Disable IMAP" OFF)
 mark_as_advanced(CURL_DISABLE_IMAP)
diff --git a/configure.ac b/configure.ac
index 434534d2fb..e4f6421d64 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4606,8 +4606,8 @@ AS_HELP_STRING([--disable-httpsig],[Disable HTTP Message Signatures support (exp
     want_httpsig="yes"
     ;;
   esac ],
-    AC_MSG_RESULT(no)
-    want_httpsig="no"
+    AC_MSG_RESULT(yes)
+    want_httpsig="yes"
 )
 
 if test "$want_httpsig" = "yes" && test "$OPENSSL_ENABLED" != "1" && test "$WOLFSSL_ENABLED" != "1"; then