diff --git a/Makefile b/Makefile
index a8fbafb..84f8421 100644
--- a/Makefile
+++ b/Makefile
@@ -123,7 +123,6 @@ LDSCRIPT= $(STARTUPLD)/STM32F072xB.ld
 # setting.
 CSRC = $(ALLCSRC) \
        $(TESTSRC) \
-       $(CONFDIR)/portab.c \
        main.c
 
 # C++ sources that can be compiled in ARM or THUMB mode depending on the global
diff --git a/source/usbcfg.c b/source/usbcfg.c
index e757238..237dab0 100644
--- a/source/usbcfg.c
+++ b/source/usbcfg.c
@@ -15,7 +15,6 @@
 */
 
 #include "hal.h"
-#include "portab.h"
 
 /* Virtual serial port over USB.*/
 SerialUSBDriver SDU1;