diff --git a/Makefile b/Makefile
index 22da80e..14d4e31 100644
--- a/Makefile
+++ b/Makefile
@@ -129,7 +129,7 @@ BMP_PORT ?= /dev/ttyACM0
 endif
 
 # compile target rules
-all: elf hex bin
+all: $(OPENCM3_LIB)/lib$(STM32F1_LIB).a elf hex bin
 
 elf: $(patsubst %,%.elf,$(FIRMWARE))
 bin: $(patsubst %,%.bin,$(FIRMWARE))