diff --git a/ext/json/generator/generator.c b/ext/json/generator/generator.c
index 2fb00ee278..8d04bef53f 100644
--- a/ext/json/generator/generator.c
+++ b/ext/json/generator/generator.c
@@ -926,11 +926,6 @@ static size_t State_memsize(const void *ptr)
     return sizeof(JSON_Generator_State);
 }
 
-#ifndef HAVE_RB_EXT_RACTOR_SAFE
-#   undef RUBY_TYPED_FROZEN_SHAREABLE
-#   define RUBY_TYPED_FROZEN_SHAREABLE 0
-#endif
-
 static const rb_data_type_t JSON_Generator_State_type = {
     "JSON/Generator/State",
     {
diff --git a/ext/json/json.h b/ext/json/json.h
index 01fe0cd034..28efa04c25 100644
--- a/ext/json/json.h
+++ b/ext/json/json.h
@@ -45,6 +45,11 @@ typedef unsigned char _Bool;
 #endif
 #endif
 
+#ifndef HAVE_RB_EXT_RACTOR_SAFE
+#   undef RUBY_TYPED_FROZEN_SHAREABLE
+#   define RUBY_TYPED_FROZEN_SHAREABLE 0
+#endif
+
 #ifndef NORETURN
 #define NORETURN(x) x
 #endif
diff --git a/ext/json/parser/parser.c b/ext/json/parser/parser.c
index e23945d0e5..2dcd1012b1 100644
--- a/ext/json/parser/parser.c
+++ b/ext/json/parser/parser.c
@@ -1554,11 +1554,6 @@ static size_t JSON_ParserConfig_memsize(const void *ptr)
     return sizeof(JSON_ParserConfig);
 }
 
-#ifndef HAVE_RB_EXT_RACTOR_SAFE
-#   undef RUBY_TYPED_FROZEN_SHAREABLE
-#   define RUBY_TYPED_FROZEN_SHAREABLE 0
-#endif
-
 static const rb_data_type_t JSON_ParserConfig_type = {
     "JSON::Ext::Parser/ParserConfig",
     {