diff --git a/libuavcan_drivers/stm32/test_stm32f107/Makefile b/libuavcan_drivers/stm32/test_stm32f107/Makefile
index 6695c37092..fe60c32483 100644
--- a/libuavcan_drivers/stm32/test_stm32f107/Makefile
+++ b/libuavcan_drivers/stm32/test_stm32f107/Makefile
@@ -17,7 +17,10 @@ CPPSRC = src/main.cpp src/dummy.cpp
 UDEFS = -DUAVCAN_STM32_CHIBIOS=1         \
         -DUAVCAN_STM32_TIMER_NUMBER=6    \
         -DUAVCAN_TINY=1                  \
-        -DUAVCAN_STM32_NUM_IFACES=2
+        -DUAVCAN_STM32_NUM_IFACES=2	 \
+        -DUAVCAN_MEM_POOL_BLOCK_SIZE=48  \
+        -DUAVCAN_PACKED_BEGIN='_Pragma("pack(1)")' \
+        -DUAVCAN_PACKED_END='_Pragma("pack()")'
 
 include ../../../libuavcan/include.mk
 CPPSRC += $(LIBUAVCAN_SRC)