-override CFLAGS = -MMD -MF$(DEP_DIR)$(patsubst %.c,%.d,$<) -pedantic -std=c99 -Wall -Wstrict-prototypes $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
+override CFLAGS = -MMD -MF$(DEP_DIR)$(patsubst %.c,%.d,$(patsubst $(TESTSRC_DIR)%,%,$<)) -I. -pedantic -std=c99 -Wall -Wstrict-prototypes $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)