diff --git a/firmware/blinky/Makefile b/firmware/blinky/Makefile
index 96e5a9ba..4d1aac31 100644
--- a/firmware/blinky/Makefile
+++ b/firmware/blinky/Makefile
@@ -2,6 +2,8 @@
 
 BINARY = blinky
 
-SRC = $(BINARY).c
+SRC = $(BINARY).c \
+	../common/hackrf_core.c \
+	../common/si5351c.c
 
 include ../common/Makefile_inc.mk
diff --git a/firmware/blinky_rom_to_ram/Makefile b/firmware/blinky_rom_to_ram/Makefile
index 936e0348..d4f487b8 100644
--- a/firmware/blinky_rom_to_ram/Makefile
+++ b/firmware/blinky_rom_to_ram/Makefile
@@ -2,7 +2,9 @@
 
 BINARY = blinky
 
-SRC = $(BINARY).c
+SRC = $(BINARY).c \
+	../common/hackrf_core.c \
+	../common/si5351c.c
 
 LDSCRIPT = ../common/LPC4330_M4_rom_to_ram.ld
 include ../common/Makefile_inc.mk