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-rw-r--r--ext/json/parser/extconf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/parser/extconf.rb b/ext/json/parser/extconf.rb
index 84049a7fe4..de5d5758b4 100644
--- a/ext/json/parser/extconf.rb
+++ b/ext/json/parser/extconf.rb
@@ -1,7 +1,7 @@
# frozen_string_literal: true
require 'mkmf'
-have_func("rb_enc_interned_str", "ruby.h") # RUBY_VERSION >= 3.0
+have_func("rb_enc_interned_str", "ruby/encoding.h") # RUBY_VERSION >= 3.0
have_func("rb_hash_new_capa", "ruby.h") # RUBY_VERSION >= 3.2
have_func("rb_hash_bulk_insert", "ruby.h") # Missing on TruffleRuby
have_func("strnlen", "string.h") # Missing on Solaris 10