diff --git a/cpu/cc2538/Makefile.cc2538 b/cpu/cc2538/Makefile.cc2538
index 9fd8a08be..46160ebfd 100644
--- a/cpu/cc2538/Makefile.cc2538
+++ b/cpu/cc2538/Makefile.cc2538
@@ -52,7 +52,7 @@ CONTIKI_CPU_SOURCEFILES += nvic.c cpu.c sys-ctrl.c gpio.c ioc.c spi.c adc.c
 CONTIKI_CPU_SOURCEFILES += cc2538-rf.c udma.c lpm.c
 CONTIKI_CPU_SOURCEFILES += dbg.c ieee-addr.c
 CONTIKI_CPU_SOURCEFILES += slip-arch.c slip.c
-CONTIKI_CPU_SOURCEFILES += i2c.c
+CONTIKI_CPU_SOURCEFILES += i2c.c cc2538-temp-sensor.c vdd3-sensor.c
 
 DEBUG_IO_SOURCEFILES += dbg-printf.c dbg-snprintf.c dbg-sprintf.c strformat.c