diff --git a/boards/cc2538dk/dist/board.resc b/boards/cc2538dk/dist/board.resc
index 5629363483f2..3ec9edd893bc 100644
--- a/boards/cc2538dk/dist/board.resc
+++ b/boards/cc2538dk/dist/board.resc
@@ -1,7 +1,6 @@
 mach create
 using sysbus
 machine LoadPlatformDescription @platforms/cpus/cc2538.repl
-machine SetClockSource cpu
 
 machine PyDevFromFile @scripts/pydev/rolling-bit.py 0x400D2004 0x4 True "sysctrl"