diff --git a/lib/stm32/nvic.c b/lib/stm32/nvic.c
index ae91bff7..ea502b3f 100644
--- a/lib/stm32/nvic.c
+++ b/lib/stm32/nvic.c
@@ -145,7 +145,7 @@ u8 nvic_get_irq_enabled(u8 irqn)
 
 void nvic_set_priority(u8 irqn, u8 priority)
 {
-	NVIC_IPR(irqn / 4) = ((priority << ((irqn % 4) * 8));
+	NVIC_IPR(irqn / 4) = (priority << ((irqn % 4) * 8));
 }
 
 /*-----------------------------------------------------------------------------*/