diff --git a/Lib/ruby/rubyapi.swg b/Lib/ruby/rubyapi.swg
index 7883e9e6c..6c5fdfee3 100644
--- a/Lib/ruby/rubyapi.swg
+++ b/Lib/ruby/rubyapi.swg
@@ -21,6 +21,14 @@ SWIG_Ruby_AppendOutput(VALUE target, VALUE o) {
   return target;
 }
 
+// For ruby1.8.4 and earlier.
+#ifndef RUBY_INIT_STACK
+   extern void Init_stack(VALUE* addr);
+#  define RUBY_INIT_STACK \
+   VALUE variable_in_this_stack_frame; \
+   Init_stack(&variable_in_this_stack_frame);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Lib/ruby/rubyhead.swg b/Lib/ruby/rubyhead.swg
index d55d49882..bf46dc88d 100644
--- a/Lib/ruby/rubyhead.swg
+++ b/Lib/ruby/rubyhead.swg
@@ -96,14 +96,5 @@
 #endif
 
 
-// For ruby1.8.4 and earlier.
-#ifndef RUBY_INIT_STACK
-   extern void Init_stack(VALUE* addr);
-#  define RUBY_INIT_STACK \
-   VALUE variable_in_this_stack_frame; \
-   Init_stack(&variable_in_this_stack_frame);
-#endif
-
-
 /* Global module used to keep some internal SWIG stuff */
 static VALUE _mSWIG = Qnil;