diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index e5f055f8c4..6865c218b1 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -51,11 +51,12 @@ jobs:
       - name: Install libraries
         run: |
           brew upgrade
-          brew install gmp libffi openssl@1.1 zlib autoconf automake libtool readline
+          brew install gmp libffi openssl@1.1 zlib autoconf automake libtool readline bison
         working-directory: src
       - name: Set ENV
         run: |
           echo "MAKEFLAGS=-j$((1 + $(sysctl -n hw.activecpu)))" >> $GITHUB_ENV
+          echo "PATH="/usr/local/opt/bison/bin:$PATH"" >> $GITHUB_ENV
       - run: ./autogen.sh
         working-directory: src
       - name: Run configure
diff --git a/ext/ripper/tools/preproc.rb b/ext/ripper/tools/preproc.rb
index b838a78db7..cd85a5da61 100644
--- a/ext/ripper/tools/preproc.rb
+++ b/ext/ripper/tools/preproc.rb
@@ -47,7 +47,7 @@ def prelude(f, out)
     when /\A%%/
       out << "%%\n"
       return
-    when /\A%token/
+    when /\A%token/, /\A} <node>/
       out << line.sub(/<\w+>/, '<val>')
     when /\A%type/
       out << line.sub(/<\w+>/, '<val>')
diff --git a/parse.y b/parse.y
index f4b4b8f3d1..f6b32d5c97 100644
--- a/parse.y
+++ b/parse.y
@@ -1140,6 +1140,14 @@ static int looking_at_eol_p(struct parser_params *p);
 %define api.pure
 %define parse.error verbose
 %printer {
+#ifndef RIPPER
+    if ($$) {
+	rb_parser_printf(p, "%s", ruby_node_name(nd_type($$)));
+    }
+#else
+#endif
+} <node>
+%printer {
 #ifndef RIPPER
     rb_parser_printf(p, "%"PRIsVALUE, rb_id2str($$));
 #else