2 files changed, 14 insertions, 8 deletions
diff --git a/ext/-test-/string/init.c b/ext/-test-/string/init.c
index 793181d148..0b3e4a6ff2 100644
--- a/ext/-test-/string/init.c
+++ b/ext/-test-/string/init.c
@@ -2,18 +2,10 @@
 
 #define init(n) {void Init_##n(VALUE klass); Init_##n(klass);}
 
-VALUE
-bug_str_modify(VALUE str)
-{
-    rb_str_modify(str);
-    return str;
-}
-
 void
 Init_string(void)
 {
     VALUE mBug = rb_define_module("Bug");
     VALUE klass = rb_define_class_under(mBug, "String", rb_cString);
-    rb_define_method(klass, "modify!", bug_str_modify, 0);
     TEST_INIT_FUNCS(init);
 }
diff --git a/ext/-test-/string/modify.c b/ext/-test-/string/modify.c
new file mode 100644
index 0000000000..a6930051b6
--- /dev/null
+++ b/ext/-test-/string/modify.c
@@ -0,0 +1,14 @@
+#include "ruby.h"
+
+VALUE
+bug_str_modify(VALUE str)
+{
+    rb_str_modify(str);
+    return str;
+}
+
+void
+Init_modify(VALUE klass)
+{
+    rb_define_method(klass, "modify!", bug_str_modify, 0);
+}