1 files changed, 4 insertions, 0 deletions
diff --git a/lib/mruby/gem.rb b/lib/mruby/gem.rb
index f967bcb35..951a5abde 100644
--- a/lib/mruby/gem.rb
+++ b/lib/mruby/gem.rb
@@ -248,6 +248,10 @@ module MRuby
           f.puts %Q[#include <mruby.h>]
         else
           f.puts %Q[#include <stdlib.h>]
+          unless build.presym_enabled?
+            f.puts %Q[#include <mruby.h>]
+            f.puts %Q[#include <mruby/proc.h>]
+          end
         end
       end