diff --git a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
index 46201eb07..8234e05dc 100755
--- a/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
+++ b/mrbgems/mruby-bin-debugger/tools/mrdb/apilist.c
@@ -197,6 +197,9 @@ mrb_debug_get_source(mrb_state *mrb, mrdb_state *mrdb, const char *srcpath, cons
     fclose(fp);
     break;
   }
+
+  mrb_free(mrb, (void *)search_path[1]);
+
   return path;
 }