diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -142,7 +142,7 @@ SYSTEM_BUILD_DIR = $(BUILD_DIR)/system
 #OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(SOURCES:.c=.o)))
 OBJECTS = $(addprefix $(BUILD_DIR)/,$(SOURCES:.c=.o))
 # add an object for the startup code
-OBJECTS += $(BUILD_DIR)/startup_stm32f042x6.o
+OBJECTS += $(BUILD_DIR)/system/startup_stm32f042x6.o
 
 # use the periphlib core library, plus generic ones (libc, libm, libnosys)
 LIBS = -lstm32cube -lc -lm -lnosys