diff --git a/include/libopencm3/lpc43xx/nvic.h b/include/libopencm3/lpc43xx/nvic.h
index 597e21a5..0fc5cc67 100644
--- a/include/libopencm3/lpc43xx/nvic.h
+++ b/include/libopencm3/lpc43xx/nvic.h
@@ -62,5 +62,7 @@
 #define NVIC_M4_C_CAN0_IRQ              51
 #define NVIC_M4_QEI_IRQ                 52
 
+#define NVIC_IRQ_COUNT 53
+
 /* LPC43xx M0 specific user interrupts */
 //TODO
diff --git a/include/libopencm3/stm32/f1/nvic_f1.h b/include/libopencm3/stm32/f1/nvic_f1.h
index 5223bb6b..1544e4fc 100644
--- a/include/libopencm3/stm32/f1/nvic_f1.h
+++ b/include/libopencm3/stm32/f1/nvic_f1.h
@@ -109,6 +109,8 @@ LGPL License Terms @ref lgpl_license
 #define NVIC_CAN2_RX1_IRQ		65
 #define NVIC_CAN2_SCE_IRQ		66
 #define NVIC_OTG_FS_IRQ			67
+
+#define NVIC_IRQ_COUNT 68
 /**@}*/
 
 #endif
diff --git a/include/libopencm3/stm32/f2/nvic_f2.h b/include/libopencm3/stm32/f2/nvic_f2.h
index 2bf29971..65a990db 100644
--- a/include/libopencm3/stm32/f2/nvic_f2.h
+++ b/include/libopencm3/stm32/f2/nvic_f2.h
@@ -109,4 +109,6 @@
 #define NVIC_CRYP_IRQ			79
 #define NVIC_HASH_RNG_IRQ		80
 
+#define NVIC_IRQ_COUNT 81
+
 #endif
diff --git a/include/libopencm3/stm32/f4/nvic_f4.h b/include/libopencm3/stm32/f4/nvic_f4.h
index 91b6c251..013e3b5d 100644
--- a/include/libopencm3/stm32/f4/nvic_f4.h
+++ b/include/libopencm3/stm32/f4/nvic_f4.h
@@ -109,4 +109,6 @@
 #define NVIC_CRYP_IRQ			79
 #define NVIC_HASH_RNG_IRQ		80
 
+#define NVIC_IRQ_COUNT 81
+
 #endif