diff --git a/ext/openssl/extconf.rb b/ext/openssl/extconf.rb
index dadf66cc0..4119c72c4 100644
--- a/ext/openssl/extconf.rb
+++ b/ext/openssl/extconf.rb
@@ -49,7 +49,7 @@
 
 have_func("rb_io_descriptor")
 have_func("rb_io_maybe_wait(0, Qnil, Qnil, Qnil)", "ruby/io.h") # Ruby 3.1
-have_var("rb_eIOTimeoutError", "ruby/io.h")
+have_func("rb_io_timeout", "ruby/io.h")
 
 Logging::message "=== Checking for system dependent stuff... ===\n"
 have_library("nsl", "t_open")
diff --git a/ext/openssl/ossl_ssl.c b/ext/openssl/ossl_ssl.c
index 3735a57f8..9f374b65f 100644
--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -1725,7 +1725,7 @@ no_exception_p(VALUE opts)
 #define RUBY_IO_TIMEOUT_DEFAULT Qnil
 #endif
 
-#ifdef HAVE_RB_EIOTIMEOUTERROR
+#ifdef HAVE_RB_IO_TIMEOUT
 #define IO_TIMEOUT_ERROR rb_eIOTimeoutError
 #else
 #define IO_TIMEOUT_ERROR rb_eIOError