diff --git a/docs/hanging-after-inactivity.md b/docs/hanging-after-inactivity.md
index f303d700..888d05f6 100644
--- a/docs/hanging-after-inactivity.md
+++ b/docs/hanging-after-inactivity.md
@@ -39,7 +39,7 @@ by the `tcp_keepalive_time` property.
 It is supported on the following platforms since ruby-oci8 2.2.4.
 
 * Linux i386 and x86_64
-* macOS
+* macOS x86_64
 * Windows x86 and x64
 * Solaris x86_64
 
diff --git a/ext/oci8/extconf.rb b/ext/oci8/extconf.rb
index d4b31566..77637c78 100644
--- a/ext/oci8/extconf.rb
+++ b/ext/oci8/extconf.rb
@@ -150,22 +150,29 @@ def fmt.%(x)
 case RUBY_PLATFORM
 when /mswin32|cygwin|mingw/
   plthook_src = "plthook_win32.c"
-when /darwin/
+when /x86_64-darwin/
   plthook_src = "plthook_osx.c"
+when /darwin/
+  # macOS arm64
+  plthook_src = nil
+  puts "skip"
 else
   plthook_src = "plthook_elf.c"
 end
-FileUtils.copy(File.dirname(__FILE__) + "/" + plthook_src, CONFTEST_C)
-if xsystem(cc_command(""))
-  FileUtils.rm_f("#{CONFTEST}.#{$OBJEXT}")
-  puts plthook_src
-  $objs << plthook_src.gsub(/\.c$/, '.o')
-  $objs << "hook_funcs.o"
-  $defs << "-DHAVE_PLTHOOK"
-  have_library('dbghelp', 'ImageDirectoryEntryToData', ['windows.h', 'dbghelp.h']) if RUBY_PLATFORM =~ /cygwin/
-  $libs += ' -lws2_32' if RUBY_PLATFORM =~ /cygwin/
-else
-  puts "no"
+
+if plthook_src
+  FileUtils.copy(File.dirname(__FILE__) + "/" + plthook_src, CONFTEST_C)
+  if xsystem(cc_command(""))
+    FileUtils.rm_f("#{CONFTEST}.#{$OBJEXT}")
+    puts plthook_src
+    $objs << plthook_src.gsub(/\.c$/, '.o')
+    $objs << "hook_funcs.o"
+    $defs << "-DHAVE_PLTHOOK"
+    have_library('dbghelp', 'ImageDirectoryEntryToData', ['windows.h', 'dbghelp.h']) if RUBY_PLATFORM =~ /cygwin/
+    $libs += ' -lws2_32' if RUBY_PLATFORM =~ /cygwin/
+  else
+    puts "no"
+  end
 end
 
 $defs << "-DInit_oci8lib=Init_#{so_basename}"