diff --git a/Makefile b/Makefile
index 15d163c..92f3c31 100644
--- a/Makefile
+++ b/Makefile
@@ -81,8 +81,9 @@ C_INCLUDES += -IDrivers/CMSIS/Device/ST/STM32F4xx/Include
 C_INCLUDES += -IDrivers/STM32F4xx_HAL_Driver/Inc
 C_INCLUDES += -IDrivers/STM32F4xx_HAL_Driver/Inc/Legacy
 # compile gcc flags
+DEFINES = -DMINIZ_NO_ARCHIVE_APIS -DMINIZ_NO_STDIO -DMINIZ_NO_TIME
 ASFLAGS = -mthumb -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-CFLAGS = -mthumb -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
+CFLAGS = -mthumb -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections $(DEFINES)
 ifeq ($(DEBUG), 1)
 CFLAGS += -g -gdwarf-2
 endif