diff --git a/ext/zstdruby/exports.txt b/ext/zstdruby/exports.txt
new file mode 100644
index 0000000..f1607c0
--- /dev/null
+++ b/ext/zstdruby/exports.txt
@@ -0,0 +1 @@
+_Init_zstdruby 
\ No newline at end of file
diff --git a/ext/zstdruby/extconf.rb b/ext/zstdruby/extconf.rb
index f153b7e..4ed2b2d 100644
--- a/ext/zstdruby/extconf.rb
+++ b/ext/zstdruby/extconf.rb
@@ -2,9 +2,14 @@
 
 have_func('rb_gc_mark_movable')
 
-$CFLAGS = '-I. -O3 -std=c99 -DZSTD_STATIC_LINKING_ONLY -DZSTD_MULTITHREAD -pthread -DDEBUGLEVEL=0'
+$CFLAGS = '-I. -O3 -std=c99 -DZSTD_STATIC_LINKING_ONLY -DZSTD_MULTITHREAD -pthread -DDEBUGLEVEL=0 -fvisibility=hidden -DZSTDLIB_VISIBLE=\'__attribute__((visibility("hidden")))\' -DZSTDLIB_HIDDEN=\'__attribute__((visibility("hidden")))\''
 $CPPFLAGS += " -fdeclspec" if CONFIG['CXX'] =~ /clang/
 
+# macOS specific: Use exported_symbols_list to control symbol visibility
+if RUBY_PLATFORM =~ /darwin/
+  $LDFLAGS += " -exported_symbols_list #{File.expand_path('exports.txt', __dir__)}"
+end
+
 Dir.chdir File.expand_path('..', __FILE__) do
   $srcs = Dir['**/*.c', '**/*.S']
 
diff --git a/ext/zstdruby/main.c b/ext/zstdruby/main.c
index e859fa0..5497b0e 100644
--- a/ext/zstdruby/main.c
+++ b/ext/zstdruby/main.c
@@ -8,7 +8,7 @@ void zstd_ruby_skippable_frame_init(void);
 void zstd_ruby_streaming_compress_init(void);
 void zstd_ruby_streaming_decompress_init(void);
 
-void
+RUBY_FUNC_EXPORTED void
 Init_zstdruby(void)
 {
 #ifdef HAVE_RB_EXT_RACTOR_SAFE