--- ./ext/ruby_debug/ruby_debug.c.gcc47	1970-01-01 09:00:00.000000000 +0900
+++ ./ext/ruby_debug/ruby_debug.c	2012-05-03 12:35:31.000000000 +0900
@@ -490,7 +490,7 @@
     if(frame_n >= debug_context->stack_len)
     {
         debug_context->stack_len += STACK_SIZE_INCREMENT;
-        debug_context->frames = REALLOC_N(debug_context->frames, debug_frame_t, debug_context->stack_len);
+        REALLOC_N(debug_context->frames, debug_frame_t, debug_context->stack_len);
     }
     debug_frame = &debug_context->frames[frame_n];
     debug_frame->file = file;