diff --git a/variants/pca10056-rc-clock/platformio.ini b/variants/pca10056-rc-clock/platformio.ini
index 2eaa223f8..0dd317816 100644
--- a/variants/pca10056-rc-clock/platformio.ini
+++ b/variants/pca10056-rc-clock/platformio.ini
@@ -4,4 +4,4 @@ extends = nrf52840_base
 board = nrf52840_dk_modified
 # add our variants files to the include and src paths
 build_flags = ${nrf52_base.build_flags} -Ivariants/pca10056-rc-clock
-src_filter = ${nrf52_base.src_filter} +<../variants/pca10056-rc-clock>
\ No newline at end of file
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/pca10056-rc-clock>
\ No newline at end of file