diff --git a/bacnet-stack/Makefile b/bacnet-stack/Makefile
index ceea3bb9..b78ce063 100644
--- a/bacnet-stack/Makefile
+++ b/bacnet-stack/Makefile
@@ -6,7 +6,7 @@ BASEDIR = .
 #CFLAGS  = -Wall -I. -O2 -g
 # Note: you can strip out symbols using the strip command
 # to get an idea of how big the compile really is.
-CFLAGS  = -Wall -I. -g
+CFLAGS  = -Wall -I. -g -DBACDL_ETHERNET=1
 
 SRCS = ports/linux/main.c \
        ports/linux/ethernet.c \
diff --git a/bacnet-stack/config.h b/bacnet-stack/config.h
index 344d464f..2f847270 100644
--- a/bacnet-stack/config.h
+++ b/bacnet-stack/config.h
@@ -20,10 +20,4 @@
 // requests available.
 #define MAX_TSM_TRANSACTIONS 16
 
-// Use only one data link layer
-//#define BACDL_ARCNET
-//#define BACDL_ETHERNET
-//#define BACDL_MSTP
-#define BACDL_BIP
-
 #endif