diff --git a/stm-firmware/main.c b/stm-firmware/main.c
index 22990b7..71d8062 100644
--- a/stm-firmware/main.c
+++ b/stm-firmware/main.c
@@ -246,7 +246,7 @@ int main()
 			pt1000_status = adc_pt1000_check_error();
 		}
 
-		error_state = pid_status->aborted | !!safety_adc_status | !!pt1000_status;
+		error_state = pid_status->aborted || !!safety_adc_status || !!pt1000_status;
 
 		menu_wait_request = reflow_menu_handle();