diff --git a/libretro/cores/dosbox/Tupfile b/libretro/cores/dosbox/Tupfile
index 5f62586..32c30d4 100644
--- a/libretro/cores/dosbox/Tupfile
+++ b/libretro/cores/dosbox/Tupfile
@@ -7,8 +7,10 @@ CORE_DIR = core
 include $(CORE_DIR)/Makefile.common
 CFLAGS += $(INCFLAGS)
 
+SOURCES_CXX += ../../libretro-common/libco/genode.cpp
+
 GIT_VERSION = `git describe --always`
 
-CFLAGS += -O3 -DNDEBUG -DGIT_VERSION=\"$(GIT_VERSION)\" -D__GENODE__
+CFLAGS += -O2 -DNDEBUG -DGIT_VERSION=\"$(GIT_VERSION)\" -D__GENODE__
 
 include $(LIBRETRO_CORE_INCLUDE)
diff --git a/libretro/cores/dosbox/runtime b/libretro/cores/dosbox/runtime
index 9d421ba..00dd2fd 100644
--- a/libretro/cores/dosbox/runtime
+++ b/libretro/cores/dosbox/runtime
@@ -1,4 +1,4 @@
-<runtime ram="32M" caps="192" binary="retro_frontend">
+<runtime ram="64M" caps="192" binary="retro_frontend">
 
 	<requires>
 		<audio_out/>