diff --git a/soc/arm/nordic_nrf/nrf51/CMakeLists.txt b/soc/arm/nordic_nrf/nrf51/CMakeLists.txt
index ded8998516a..2c6a5edb258 100644
--- a/soc/arm/nordic_nrf/nrf51/CMakeLists.txt
+++ b/soc/arm/nordic_nrf/nrf51/CMakeLists.txt
@@ -1,10 +1,3 @@
-# NB: The define 'NRF51822' is deprecated. 'NRF51' should be used in
-# it's place.
-zephyr_compile_definitions_ifdef(
-  CONFIG_SOC_SERIES_NRF51X
-  NRF51822
-  )
-
 zephyr_sources(
   power.c
   soc.c