diff --git a/runtime/Makefile b/runtime/Makefile
index ecd7251..2e8c45f 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -14,10 +14,10 @@ CFLAGS += -DX86_64
 #CFLAGS += -DDEBUG 
 CFLAGS += -D_GNU_SOURCE
 #CFLAGS += -DNOSTDIO
-CFLAGS += -DSTANDALONE
-#CFLAGS += -DUSE_UVIO
-CFLAGS += -DUSE_SYSCALL
-CFLAGS += -DPREEMPT_DISABLE
+#CFLAGS += -DSTANDALONE
+CFLAGS += -DUSE_UVIO
+#CFLAGS += -DUSE_SYSCALL
+#CFLAGS += -DPREEMPT_DISABLE
 
 MAKE= make --no-print-directory