diff --git a/include/libopencm3/stm32/f4/memorymap.h b/include/libopencm3/stm32/f4/memorymap.h
index 759e477f..6b96ac01 100644
--- a/include/libopencm3/stm32/f4/memorymap.h
+++ b/include/libopencm3/stm32/f4/memorymap.h
@@ -59,7 +59,7 @@
 #define I2C1_BASE			(PERIPH_BASE_APB1 + 0x5400)
 #define I2C2_BASE			(PERIPH_BASE_APB1 + 0x5800)
 #define I2C3_BASE			(PERIPH_BASE_APB1 + 0x5C00)
-/* PERIPH_BASE_APB1 + 0x6000 (0x4000 6000 - 0x4000 63FF): Reserved */
+#define FMPI2C1_BASE			(PERIPH_BASE_APB1 + 0x6000)
 #define BX_CAN1_BASE			(PERIPH_BASE_APB1 + 0x6400)
 #define BX_CAN2_BASE			(PERIPH_BASE_APB1 + 0x6800)
 /* PERIPH_BASE_APB1 + 0x6C00 (0x4000 6C00 - 0x4000 6FFF): Reserved */