diff --git a/runtime/Makefile b/runtime/Makefile
index 8311e2f..4ab5cbf 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -57,9 +57,7 @@ CFLAGS += -D${ARCH}
 CFLAGS += -DNCORES=${TOTAL_CORES}
 CFLAGS += -DPAGE_SIZE=$(PAGE_SIZE)
 #CFLAGS += -DPREEMPT_DISABLE
-#CFLAGS += -DUSE_HTTP_UVIO #-DUSE_HTTP_SYNC
 CFLAGS += -D${USE_MEM}
-#CFLAGS += -DUSE_SYSCALL
 
 # Preprocessor
 LDFLAGS += -Wl,--export-dynamic -ldl -lm