ext/extzstd.c in extzstd-0.3.1 vs ext/extzstd.c in extzstd-0.3.2

@@ -1,10 +1,14 @@
 #include "extzstd.h"
 #include <zstd/lib/common/mem.h>
 #include <zstd_errors.h>
 #include <zdict.h>
 
+#ifndef RB_EXT_RACTOR_SAFE
+# define RB_EXT_RACTOR_SAFE(FEATURE) ((void)(FEATURE))
+#endif
+
 VALUE extzstd_mZstd;
 
 static ID id_initialize;
 static ID id_error_code;
 
@@ -611,9 +615,11 @@
  */
 
 RBEXT_API void
 Init_extzstd(void)
 {
+    RB_EXT_RACTOR_SAFE(true);
+
     id_initialize = rb_intern("initialize");
     id_error_code = rb_intern("error_code");
 
     extzstd_mZstd = rb_define_module("Zstd");