1 files changed, 1 insertions, 0 deletions
diff --git a/os/ports/GCC/ARMCM3/nvic.c b/os/ports/GCC/ARMCM3/nvic.c
index c34aaf4ea..e61637848 100644
--- a/os/ports/GCC/ARMCM3/nvic.c
+++ b/os/ports/GCC/ARMCM3/nvic.c
@@ -39,6 +39,7 @@ void NVICEnableVector(uint32_t n, uint32_t prio) {
   unsigned sh = (n & 3) << 3;
 
   NVIC_IPR(n >> 2) = (NVIC_IPR(n >> 2) & ~(0xFF << sh)) | (prio << sh);
+  NVIC_ICPR(n >> 5) = 1 << (n & 0x1F);
   NVIC_ISER(n >> 5) = 1 << (n & 0x1F);
 }