diff --git a/ports/nrf/Makefile b/ports/nrf/Makefile
index 8951809a00..aff03443dc 100644
--- a/ports/nrf/Makefile
+++ b/ports/nrf/Makefile
@@ -151,7 +151,7 @@ SRC_C += \
  	lib/timeutils/timeutils.c \
  	lib/utils/buffer_helper.c \
  	lib/utils/context_manager_helpers.c \
-  lib/utils/interrupt_char.c \
+ 	lib/utils/interrupt_char.c \
  	lib/utils/pyexec.c \
 	lib/libc/string0.c \
 	lib/mp-readline/readline.c \