diff --git a/lib/stm32/timer.c b/lib/stm32/timer.c
index d3c26e81..1a346ef9 100644
--- a/lib/stm32/timer.c
+++ b/lib/stm32/timer.c
@@ -1913,7 +1913,7 @@ void timer_ic_set_input(u32 timer_peripheral, enum tim_ic_id ic, enum tim_ic_inp
 	in &= 3;
 
 	if (((ic == TIM_IC2) || (ic == TIM_IC4)) &&
-	    ((in == TIM_IC_IN_TI1) || (in = TIM_IC_IN_TI2))) {
+	    ((in == TIM_IC_IN_TI1) || (in == TIM_IC_IN_TI2))) {
 		/* Input select bits are flipped for these combinations */
 		in ^= 3;
 	}