diff --git a/cpu/stm32f4/Makefile.include b/cpu/stm32f4/Makefile.include
index 4d3c26695c..e6ee4ee22f 100644
--- a/cpu/stm32f4/Makefile.include
+++ b/cpu/stm32f4/Makefile.include
@@ -1,5 +1,22 @@
 export CPU_ARCH = cortex-m4f
 export CPU_FAM  = stm32f4
 
+# STM32F4 uses sectors instead of pages, where the minimum sector length is 16KB
+# (the first sector), therefore RIOTBOOT_LEN must be 16KB to cover a whole sector.
+RIOTBOOT_LEN ?= 0x4000
+
+# CPU_IRQ_NUMOF for STM32F4 boards is < 102+16 so (118*4 bytes = 472 bytes ~= 0x200)
+# RIOTBOOT_HDR_LEN can be set to 0x200.
+# Details on alignment requirements for M4 in `cpu/cortexm_common/Makefile.include`.
+RIOTBOOT_HDR_LEN ?= 0x200
+
+# Sectors don't have the same length. Per bank there can be up to 12 sectors. The
+# first 4 sectors are 16kB long, the 5th is 64kB and the remaining 7 are 128kB.
+# Since flash can only be erased by sector, slots can't overlap over sectors.
+# RIOTBOOT_LEN is removed twice, once at the start of the flash for the bootloader,
+# and a second time at the end of the flash, to get evenly sized and distributed slots.
+SLOT0_LEN ?= $(shell printf "0x%x" $$((($(ROM_LEN:%K=%*1024)-2*$(RIOTBOOT_LEN)) / $(NUM_SLOTS))))
+SLOT1_LEN ?= $(SLOT0_LEN)
+
 include $(RIOTCPU)/stm32_common/Makefile.include
 include $(RIOTMAKE)/arch/cortexm.inc.mk